Finding the Third Proportional to 55,418 and 83,780

Step by Step Solution

1. Step 1: Write the proportion equation
   55,418 : 83,780 = 83,780 : x
2. Step 2: Convert to fraction form
   55,418/83,780 = 83,780/x
3. Step 3: Cross multiply
   55,418x = 83,780 × 83,780
4. Step 4: Simplify right side
   55,418x = 7,019,088,400
5. Step 5: Solve for x
   x = 7,019,088,400/55,418
6. Step 6: Final answer
   x = 126,657.19