Finding the Fourth Proportional to 100,499.68, 138,700.56 and 57,483.12

Step by Step Solution

1. Step 1: Write the proportion equation
   100,499.68 : 138,700.56 = 57,483.12 : x
2. Step 2: Convert to fraction form
   100,499.68/138,700.56 = 57,483.12/x
3. Step 3: Cross multiply
   100,499.68x = 138,700.56 × 57,483.12
4. Step 4: Simplify right side
   100,499.68x = 7,972,940,934.55
5. Step 5: Solve for x
   x = 7,972,940,934.55/100,499.68
6. Step 6: Final answer
   x = 79,333.00