Finding the Fourth Proportional to 156,980.50, 216,652.71 and 89,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,980.50 : 216,652.71 = 89,912.50 : x
2. Step 2: Convert to fraction form
   156,980.50/216,652.71 = 89,912.50/x
3. Step 3: Cross multiply
   156,980.50x = 216,652.71 × 89,912.50
4. Step 4: Simplify right side
   156,980.50x = 19,479,786,787.88
5. Step 5: Solve for x
   x = 19,479,786,787.88/156,980.50
6. Step 6: Final answer
   x = 124,090.49