Finding the Fourth Proportional to 138,648.72, 207,783.45 and 75,386.10

Step by Step Solution

1. Step 1: Write the proportion equation
   138,648.72 : 207,783.45 = 75,386.10 : x
2. Step 2: Convert to fraction form
   138,648.72/207,783.45 = 75,386.10/x
3. Step 3: Cross multiply
   138,648.72x = 207,783.45 × 75,386.10
4. Step 4: Simplify right side
   138,648.72x = 15,663,983,940.05
5. Step 5: Solve for x
   x = 15,663,983,940.05/138,648.72
6. Step 6: Final answer
   x = 112,976.04