Finding the Fourth Proportional to 138,947.42, 208,700.10 and 82,896.87

Step by Step Solution

1. Step 1: Write the proportion equation
   138,947.42 : 208,700.10 = 82,896.87 : x
2. Step 2: Convert to fraction form
   138,947.42/208,700.10 = 82,896.87/x
3. Step 3: Cross multiply
   138,947.42x = 208,700.10 × 82,896.87
4. Step 4: Simplify right side
   138,947.42x = 17,300,585,058.69
5. Step 5: Solve for x
   x = 17,300,585,058.69/138,947.42
6. Step 6: Final answer
   x = 124,511.74