Finding the Fourth Proportional to 404,890.76, 606,157.52 and 212,308.52

Step by Step Solution

1. Step 1: Write the proportion equation
   404,890.76 : 606,157.52 = 212,308.52 : x
2. Step 2: Convert to fraction form
   404,890.76/606,157.52 = 212,308.52/x
3. Step 3: Cross multiply
   404,890.76x = 606,157.52 × 212,308.52
4. Step 4: Simplify right side
   404,890.76x = 128,692,401,865.74
5. Step 5: Solve for x
   x = 128,692,401,865.74/404,890.76
6. Step 6: Final answer
   x = 317,844.75