Finding the Fourth Proportional to 140,752.10, 211,164.15 and 99,280.10

Step by Step Solution

1. Step 1: Write the proportion equation
   140,752.10 : 211,164.15 = 99,280.10 : x
2. Step 2: Convert to fraction form
   140,752.10/211,164.15 = 99,280.10/x
3. Step 3: Cross multiply
   140,752.10x = 211,164.15 × 99,280.10
4. Step 4: Simplify right side
   140,752.10x = 20,964,397,928.42
5. Step 5: Solve for x
   x = 20,964,397,928.42/140,752.10
6. Step 6: Final answer
   x = 148,945.54