Finding the Third Proportional to 64,280 and 138,426

Step by Step Solution

1. Step 1: Write the proportion equation
   64,280 : 138,426 = 138,426 : x
2. Step 2: Convert to fraction form
   64,280/138,426 = 138,426/x
3. Step 3: Cross multiply
   64,280x = 138,426 × 138,426
4. Step 4: Simplify right side
   64,280x = 19,161,757,476
5. Step 5: Solve for x
   x = 19,161,757,476/64,280
6. Step 6: Final answer
   x = 298,098.28