Finding the Third Proportional to 138,130.31 and 300,856.78

Step by Step Solution

1. Step 1: Write the proportion equation
   138,130.31 : 300,856.78 = 300,856.78 : x
2. Step 2: Convert to fraction form
   138,130.31/300,856.78 = 300,856.78/x
3. Step 3: Cross multiply
   138,130.31x = 300,856.78 × 300,856.78
4. Step 4: Simplify right side
   138,130.31x = 90,514,802,824.11
5. Step 5: Solve for x
   x = 90,514,802,824.11/138,130.31
6. Step 6: Final answer
   x = 655,285.59