Finding the Fourth Proportional to 71,513.30, 99,987.40 and 71,513.30

Step by Step Solution

1. Step 1: Write the proportion equation
   71,513.30 : 99,987.40 = 71,513.30 : x
2. Step 2: Convert to fraction form
   71,513.30/99,987.40 = 71,513.30/x
3. Step 3: Cross multiply
   71,513.30x = 99,987.40 × 71,513.30
4. Step 4: Simplify right side
   71,513.30x = 7,150,428,932.42
5. Step 5: Solve for x
   x = 7,150,428,932.42/71,513.30
6. Step 6: Final answer
   x = 99,987.40