Finding the Fourth Proportional to 156,940.76, 216,577.59 and 85,321.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,940.76 : 216,577.59 = 85,321.10 : x
2. Step 2: Convert to fraction form
   156,940.76/216,577.59 = 85,321.10/x
3. Step 3: Cross multiply
   156,940.76x = 216,577.59 × 85,321.10
4. Step 4: Simplify right side
   156,940.76x = 18,478,638,214.15
5. Step 5: Solve for x
   x = 18,478,638,214.15/156,940.76
6. Step 6: Final answer
   x = 117,742.76