Finding the Fourth Proportional to 99,089.31, 136,743.35 and 56,648.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,089.31 : 136,743.35 = 56,648.76 : x
2. Step 2: Convert to fraction form
   99,089.31/136,743.35 = 56,648.76/x
3. Step 3: Cross multiply
   99,089.31x = 136,743.35 × 56,648.76
4. Step 4: Simplify right side
   99,089.31x = 7,746,341,215.75
5. Step 5: Solve for x
   x = 7,746,341,215.75/99,089.31
6. Step 6: Final answer
   x = 78,175.35