Finding the Fourth Proportional to 156,978.05, 216,633.83 and 85,362.30

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978.05 : 216,633.83 = 85,362.30 : x
2. Step 2: Convert to fraction form
   156,978.05/216,633.83 = 85,362.30/x
3. Step 3: Cross multiply
   156,978.05x = 216,633.83 × 85,362.30
4. Step 4: Simplify right side
   156,978.05x = 18,492,361,559.80
5. Step 5: Solve for x
   x = 18,492,361,559.80/156,978.05
6. Step 6: Final answer
   x = 117,802.22