Finding the Fourth Proportional to 99,787.47, 137,706.71 and 68,011.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,787.47 : 137,706.71 = 68,011.88 : x
2. Step 2: Convert to fraction form
   99,787.47/137,706.71 = 68,011.88/x
3. Step 3: Cross multiply
   99,787.47x = 137,706.71 × 68,011.88
4. Step 4: Simplify right side
   99,787.47x = 9,365,692,061.48
5. Step 5: Solve for x
   x = 9,365,692,061.48/99,787.47
6. Step 6: Final answer
   x = 93,856.39