Finding the Fourth Proportional to 99,468.32, 137,223.12 and 57,017.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,468.32 : 137,223.12 = 57,017.12 : x
2. Step 2: Convert to fraction form
   99,468.32/137,223.12 = 57,017.12/x
3. Step 3: Cross multiply
   99,468.32x = 137,223.12 × 57,017.12
4. Step 4: Simplify right side
   99,468.32x = 7,824,067,099.81
5. Step 5: Solve for x
   x = 7,824,067,099.81/99,468.32
6. Step 6: Final answer
   x = 78,658.88