Finding the Fourth Proportional to 156,856.50, 216,491.13 and 89,788.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,856.50 : 216,491.13 = 89,788.50 : x
2. Step 2: Convert to fraction form
   156,856.50/216,491.13 = 89,788.50/x
3. Step 3: Cross multiply
   156,856.50x = 216,491.13 × 89,788.50
4. Step 4: Simplify right side
   156,856.50x = 19,438,413,826.01
5. Step 5: Solve for x
   x = 19,438,413,826.01/156,856.50
6. Step 6: Final answer
   x = 123,924.82