Finding the Fourth Proportional to 108,687.86, 149,990.78 and 65,661.37

Step by Step Solution

1. Step 1: Write the proportion equation
   108,687.86 : 149,990.78 = 65,661.37 : x
2. Step 2: Convert to fraction form
   108,687.86/149,990.78 = 65,661.37/x
3. Step 3: Cross multiply
   108,687.86x = 149,990.78 × 65,661.37
4. Step 4: Simplify right side
   108,687.86x = 9,848,600,102.17
5. Step 5: Solve for x
   x = 9,848,600,102.17/108,687.86
6. Step 6: Final answer
   x = 90,613.61