Finding the Fourth Proportional to 156,986.50, 216,661 and 89,918.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,986.50 : 216,661 = 89,918.50 : x
2. Step 2: Convert to fraction form
   156,986.50/216,661 = 89,918.50/x
3. Step 3: Cross multiply
   156,986.50x = 216,661 × 89,918.50
4. Step 4: Simplify right side
   156,986.50x = 19,481,832,128.50
5. Step 5: Solve for x
   x = 19,481,832,128.50/156,986.50
6. Step 6: Final answer
   x = 124,098.77