Finding the Fourth Proportional to 138,387.84, 207,647.37 and 82,338.72

Step by Step Solution

1. Step 1: Write the proportion equation
   138,387.84 : 207,647.37 = 82,338.72 : x
2. Step 2: Convert to fraction form
   138,387.84/207,647.37 = 82,338.72/x
3. Step 3: Cross multiply
   138,387.84x = 207,647.37 × 82,338.72
4. Step 4: Simplify right side
   138,387.84x = 17,097,418,657.17
5. Step 5: Solve for x
   x = 17,097,418,657.17/138,387.84
6. Step 6: Final answer
   x = 123,547.12