Finding the Fourth Proportional to 428,982.32, 643,527.12 and 129,462.42

Step by Step Solution

1. Step 1: Write the proportion equation
   428,982.32 : 643,527.12 = 129,462.42 : x
2. Step 2: Convert to fraction form
   428,982.32/643,527.12 = 129,462.42/x
3. Step 3: Cross multiply
   428,982.32x = 643,527.12 × 129,462.42
4. Step 4: Simplify right side
   428,982.32x = 83,312,578,290.83
5. Step 5: Solve for x
   x = 83,312,578,290.83/428,982.32
6. Step 6: Final answer
   x = 194,209.82