Finding the Fourth Proportional to 81,435.20, 112,434.72 and 62,538.56

Step by Step Solution

1. Step 1: Write the proportion equation
   81,435.20 : 112,434.72 = 62,538.56 : x
2. Step 2: Convert to fraction form
   81,435.20/112,434.72 = 62,538.56/x
3. Step 3: Cross multiply
   81,435.20x = 112,434.72 × 62,538.56
4. Step 4: Simplify right side
   81,435.20x = 7,031,505,482.80
5. Step 5: Solve for x
   x = 7,031,505,482.80/81,435.20
6. Step 6: Final answer
   x = 86,344.79