Finding the Fourth Proportional to 208,025.10, 311,247.90 and 138,041.10

Step by Step Solution

1. Step 1: Write the proportion equation
   208,025.10 : 311,247.90 = 138,041.10 : x
2. Step 2: Convert to fraction form
   208,025.10/311,247.90 = 138,041.10/x
3. Step 3: Cross multiply
   208,025.10x = 311,247.90 × 138,041.10
4. Step 4: Simplify right side
   208,025.10x = 42,965,002,488.69
5. Step 5: Solve for x
   x = 42,965,002,488.69/208,025.10
6. Step 6: Final answer
   x = 206,537.59