Finding the Fourth Proportional to 157,689.50, 236,638.71 and 86,661.74

Step by Step Solution

1. Step 1: Write the proportion equation
   157,689.50 : 236,638.71 = 86,661.74 : x
2. Step 2: Convert to fraction form
   157,689.50/236,638.71 = 86,661.74/x
3. Step 3: Cross multiply
   157,689.50x = 236,638.71 × 86,661.74
4. Step 4: Simplify right side
   157,689.50x = 20,507,522,280.81
5. Step 5: Solve for x
   x = 20,507,522,280.81/157,689.50
6. Step 6: Final answer
   x = 130,050.02