Finding the Fourth Proportional to 99,976.16, 137,967.21 and 57,534.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,976.16 : 137,967.21 = 57,534.72 : x
2. Step 2: Convert to fraction form
   99,976.16/137,967.21 = 57,534.72/x
3. Step 3: Cross multiply
   99,976.16x = 137,967.21 × 57,534.72
4. Step 4: Simplify right side
   99,976.16x = 7,937,904,796.53
5. Step 5: Solve for x
   x = 7,937,904,796.53/99,976.16
6. Step 6: Final answer
   x = 79,397.98