Finding the Third Proportional to 53,478 and 83,142

Step by Step Solution

1. Step 1: Write the proportion equation
   53,478 : 83,142 = 83,142 : x
2. Step 2: Convert to fraction form
   53,478/83,142 = 83,142/x
3. Step 3: Cross multiply
   53,478x = 83,142 × 83,142
4. Step 4: Simplify right side
   53,478x = 6,912,592,164
5. Step 5: Solve for x
   x = 6,912,592,164/53,478
6. Step 6: Final answer
   x = 129,260.48