Finding the Third Proportional to 77,418 and 113,139

Step by Step Solution

1. Step 1: Write the proportion equation
   77,418 : 113,139 = 113,139 : x
2. Step 2: Convert to fraction form
   77,418/113,139 = 113,139/x
3. Step 3: Cross multiply
   77,418x = 113,139 × 113,139
4. Step 4: Simplify right side
   77,418x = 12,800,433,321
5. Step 5: Solve for x
   x = 12,800,433,321/77,418
6. Step 6: Final answer
   x = 165,341.82