Finding the Third Proportional to 64,359.50 and 138,404.75

Step by Step Solution

1. Step 1: Write the proportion equation
   64,359.50 : 138,404.75 = 138,404.75 : x
2. Step 2: Convert to fraction form
   64,359.50/138,404.75 = 138,404.75/x
3. Step 3: Cross multiply
   64,359.50x = 138,404.75 × 138,404.75
4. Step 4: Simplify right side
   64,359.50x = 19,155,874,822.56
5. Step 5: Solve for x
   x = 19,155,874,822.56/64,359.50
6. Step 6: Final answer
   x = 297,638.65