Finding the Fourth Proportional to 429,152.28, 643,788.57 and 129,598.89

Step by Step Solution

1. Step 1: Write the proportion equation
   429,152.28 : 643,788.57 = 129,598.89 : x
2. Step 2: Convert to fraction form
   429,152.28/643,788.57 = 129,598.89/x
3. Step 3: Cross multiply
   429,152.28x = 643,788.57 × 129,598.89
4. Step 4: Simplify right side
   429,152.28x = 83,434,284,066.69
5. Step 5: Solve for x
   x = 83,434,284,066.69/429,152.28
6. Step 6: Final answer
   x = 194,416.50