Finding the Fourth Proportional to 138,103.72, 207,185.94 and 81,995.02

Step by Step Solution

1. Step 1: Write the proportion equation
   138,103.72 : 207,185.94 = 81,995.02 : x
2. Step 2: Convert to fraction form
   138,103.72/207,185.94 = 81,995.02/x
3. Step 3: Cross multiply
   138,103.72x = 207,185.94 × 81,995.02
4. Step 4: Simplify right side
   138,103.72x = 16,988,215,294.02
5. Step 5: Solve for x
   x = 16,988,215,294.02/138,103.72
6. Step 6: Final answer
   x = 123,010.56