Finding the Fourth Proportional to 98,658.72, 136,152.72 and 56,216.16

Step by Step Solution

1. Step 1: Write the proportion equation
   98,658.72 : 136,152.72 = 56,216.16 : x
2. Step 2: Convert to fraction form
   98,658.72/136,152.72 = 56,216.16/x
3. Step 3: Cross multiply
   98,658.72x = 136,152.72 × 56,216.16
4. Step 4: Simplify right side
   98,658.72x = 7,653,983,091.96
5. Step 5: Solve for x
   x = 7,653,983,091.96/98,658.72
6. Step 6: Final answer
   x = 77,580.40