Finding the Fourth Proportional to 99,987.52, 138,013.52 and 57,574.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,987.52 : 138,013.52 = 57,574.32 : x
2. Step 2: Convert to fraction form
   99,987.52/138,013.52 = 57,574.32/x
3. Step 3: Cross multiply
   99,987.52x = 138,013.52 × 57,574.32
4. Step 4: Simplify right side
   99,987.52x = 7,946,034,564.81
5. Step 5: Solve for x
   x = 7,946,034,564.81/99,987.52
6. Step 6: Final answer
   x = 79,470.26