Finding the Fourth Proportional to 253,651.20, 380,493.20 and 85,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   253,651.20 : 380,493.20 = 85,164.72 : x
2. Step 2: Convert to fraction form
   253,651.20/380,493.20 = 85,164.72/x
3. Step 3: Cross multiply
   253,651.20x = 380,493.20 × 85,164.72
4. Step 4: Simplify right side
   253,651.20x = 32,404,596,839.90
5. Step 5: Solve for x
   x = 32,404,596,839.90/253,651.20
6. Step 6: Final answer
   x = 127,752.59