Finding the Fourth Proportional to 156,978.93, 216,626.32 and 89,002.17

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978.93 : 216,626.32 = 89,002.17 : x
2. Step 2: Convert to fraction form
   156,978.93/216,626.32 = 89,002.17/x
3. Step 3: Cross multiply
   156,978.93x = 216,626.32 × 89,002.17
4. Step 4: Simplify right side
   156,978.93x = 19,280,212,559.11
5. Step 5: Solve for x
   x = 19,280,212,559.11/156,978.93
6. Step 6: Final answer
   x = 122,820.38