Finding the Fourth Proportional to 99,855.14, 137,766.89 and 65,880.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,855.14 : 137,766.89 = 65,880.50 : x
2. Step 2: Convert to fraction form
   99,855.14/137,766.89 = 65,880.50/x
3. Step 3: Cross multiply
   99,855.14x = 137,766.89 × 65,880.50
4. Step 4: Simplify right side
   99,855.14x = 9,076,151,072.51
5. Step 5: Solve for x
   x = 9,076,151,072.51/99,855.14
6. Step 6: Final answer
   x = 90,893.18