Finding the Fourth Proportional to 99,690.32, 137,567.16 and 56,663.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99,690.32 : 137,567.16 = 56,663.82 : x
2. Step 2: Convert to fraction form
   99,690.32/137,567.16 = 56,663.82/x
3. Step 3: Cross multiply
   99,690.32x = 137,567.16 × 56,663.82
4. Step 4: Simplify right side
   99,690.32x = 7,795,080,792.15
5. Step 5: Solve for x
   x = 7,795,080,792.15/99,690.32
6. Step 6: Final answer
   x = 78,192.96