Finding the Fourth Proportional to 429,052.59, 643,328.60 and 129,443.31

Step by Step Solution

1. Step 1: Write the proportion equation
   429,052.59 : 643,328.60 = 129,443.31 : x
2. Step 2: Convert to fraction form
   429,052.59/643,328.60 = 129,443.31/x
3. Step 3: Cross multiply
   429,052.59x = 643,328.60 × 129,443.31
4. Step 4: Simplify right side
   429,052.59x = 83,274,582,754.45
5. Step 5: Solve for x
   x = 83,274,582,754.45/429,052.59
6. Step 6: Final answer
   x = 194,089.45