Finding the Fourth Proportional to 108,530.10, 162,989.55 and 78,981.30

Step by Step Solution

1. Step 1: Write the proportion equation
   108,530.10 : 162,989.55 = 78,981.30 : x
2. Step 2: Convert to fraction form
   108,530.10/162,989.55 = 78,981.30/x
3. Step 3: Cross multiply
   108,530.10x = 162,989.55 × 78,981.30
4. Step 4: Simplify right side
   108,530.10x = 12,873,126,545.42
5. Step 5: Solve for x
   x = 12,873,126,545.42/108,530.10
6. Step 6: Final answer
   x = 118,613.42