Finding the Fourth Proportional to 99,218.18, 136,913.98 and 56,185.30

Step by Step Solution

1. Step 1: Write the proportion equation
   99,218.18 : 136,913.98 = 56,185.30 : x
2. Step 2: Convert to fraction form
   99,218.18/136,913.98 = 56,185.30/x
3. Step 3: Cross multiply
   99,218.18x = 136,913.98 × 56,185.30
4. Step 4: Simplify right side
   99,218.18x = 7,692,553,040.49
5. Step 5: Solve for x
   x = 7,692,553,040.49/99,218.18
6. Step 6: Final answer
   x = 77,531.69