Finding the Fourth Proportional to 139,851.32, 209,518.05 and 108,149

Step by Step Solution

1. Step 1: Write the proportion equation
   139,851.32 : 209,518.05 = 108,149 : x
2. Step 2: Convert to fraction form
   139,851.32/209,518.05 = 108,149/x
3. Step 3: Cross multiply
   139,851.32x = 209,518.05 × 108,149
4. Step 4: Simplify right side
   139,851.32x = 22,659,167,589.45
5. Step 5: Solve for x
   x = 22,659,167,589.45/139,851.32
6. Step 6: Final answer
   x = 162,023.27