Finding the Fourth Proportional to 404,429.76, 606,644.84 and 138,192.89

Step by Step Solution

1. Step 1: Write the proportion equation
   404,429.76 : 606,644.84 = 138,192.89 : x
2. Step 2: Convert to fraction form
   404,429.76/606,644.84 = 138,192.89/x
3. Step 3: Cross multiply
   404,429.76x = 606,644.84 × 138,192.89
4. Step 4: Simplify right side
   404,429.76x = 83,834,000,955.45
5. Step 5: Solve for x
   x = 83,834,000,955.45/404,429.76
6. Step 6: Final answer
   x = 207,289.40