Finding the Fourth Proportional to 107,872.10, 162,002.55 and 78,323.30

Step by Step Solution

1. Step 1: Write the proportion equation
   107,872.10 : 162,002.55 = 78,323.30 : x
2. Step 2: Convert to fraction form
   107,872.10/162,002.55 = 78,323.30/x
3. Step 3: Cross multiply
   107,872.10x = 162,002.55 × 78,323.30
4. Step 4: Simplify right side
   107,872.10x = 12,688,574,324.42
5. Step 5: Solve for x
   x = 12,688,574,324.42/107,872.10
6. Step 6: Final answer
   x = 117,626.10