Finding the Third Proportional to 60,031.13 and 138,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   60,031.13 : 138,978.56 = 138,978.56 : x
2. Step 2: Convert to fraction form
   60,031.13/138,978.56 = 138,978.56/x
3. Step 3: Cross multiply
   60,031.13x = 138,978.56 × 138,978.56
4. Step 4: Simplify right side
   60,031.13x = 19,315,040,834.57
5. Step 5: Solve for x
   x = 19,315,040,834.57/60,031.13
6. Step 6: Final answer
   x = 321,750.44