Finding the Third Proportional to 51,140 and 78,492

Step by Step Solution

1. Step 1: Write the proportion equation
   51,140 : 78,492 = 78,492 : x
2. Step 2: Convert to fraction form
   51,140/78,492 = 78,492/x
3. Step 3: Cross multiply
   51,140x = 78,492 × 78,492
4. Step 4: Simplify right side
   51,140x = 6,160,994,064
5. Step 5: Solve for x
   x = 6,160,994,064/51,140
6. Step 6: Final answer
   x = 120,473.09