Finding the Third Proportional to 31,242 and 63,340

Step by Step Solution

1. Step 1: Write the proportion equation
   31,242 : 63,340 = 63,340 : x
2. Step 2: Convert to fraction form
   31,242/63,340 = 63,340/x
3. Step 3: Cross multiply
   31,242x = 63,340 × 63,340
4. Step 4: Simplify right side
   31,242x = 4,011,955,600
5. Step 5: Solve for x
   x = 4,011,955,600/31,242
6. Step 6: Final answer
   x = 128,415.45