Finding the Fourth Proportional to 429,908.91, 644,921.69 and 149,389.71

Step by Step Solution

1. Step 1: Write the proportion equation
   429,908.91 : 644,921.69 = 149,389.71 : x
2. Step 2: Convert to fraction form
   429,908.91/644,921.69 = 149,389.71/x
3. Step 3: Cross multiply
   429,908.91x = 644,921.69 × 149,389.71
4. Step 4: Simplify right side
   429,908.91x = 96,344,663,494.86
5. Step 5: Solve for x
   x = 96,344,663,494.86/429,908.91
6. Step 6: Final answer
   x = 224,104.83