Finding the Third Proportional to 60,840 and 89,160

Step by Step Solution

1. Step 1: Write the proportion equation
   60,840 : 89,160 = 89,160 : x
2. Step 2: Convert to fraction form
   60,840/89,160 = 89,160/x
3. Step 3: Cross multiply
   60,840x = 89,160 × 89,160
4. Step 4: Simplify right side
   60,840x = 7,949,505,600
5. Step 5: Solve for x
   x = 7,949,505,600/60,840
6. Step 6: Final answer
   x = 130,662.49