Finding the Third Proportional to 56,640 and 89,981

Step by Step Solution

1. Step 1: Write the proportion equation
   56,640 : 89,981 = 89,981 : x
2. Step 2: Convert to fraction form
   56,640/89,981 = 89,981/x
3. Step 3: Cross multiply
   56,640x = 89,981 × 89,981
4. Step 4: Simplify right side
   56,640x = 8,096,580,361
5. Step 5: Solve for x
   x = 8,096,580,361/56,640
6. Step 6: Final answer
   x = 142,948.10