Finding the Fourth Proportional to 404,756,128.80, 558,563,644.56 and 219,117,144.42

Step by Step Solution

1. Step 1: Write the proportion equation
   404,756,128.80 : 558,563,644.56 = 219,117,144.42 : x
2. Step 2: Convert to fraction form
   404,756,128.80/558,563,644.56 = 219,117,144.42/x
3. Step 3: Cross multiply
   404,756,128.80x = 558,563,644.56 × 219,117,144.42
4. Step 4: Simplify right side
   404,756,128.80x = 122,390,870,772,815,040
5. Step 5: Solve for x
   x = 122,390,870,772,815,040/404,756,128.80
6. Step 6: Final answer
   x = 302,381,760.43