Finding the Third Proportional to 57,781 and 88,690

Step by Step Solution

1. Step 1: Write the proportion equation
   57,781 : 88,690 = 88,690 : x
2. Step 2: Convert to fraction form
   57,781/88,690 = 88,690/x
3. Step 3: Cross multiply
   57,781x = 88,690 × 88,690
4. Step 4: Simplify right side
   57,781x = 7,865,916,100
5. Step 5: Solve for x
   x = 7,865,916,100/57,781
6. Step 6: Final answer
   x = 136,133.26