Finding the Third Proportional to 66,988 and 89,359

Step by Step Solution

1. Step 1: Write the proportion equation
   66,988 : 89,359 = 89,359 : x
2. Step 2: Convert to fraction form
   66,988/89,359 = 89,359/x
3. Step 3: Cross multiply
   66,988x = 89,359 × 89,359
4. Step 4: Simplify right side
   66,988x = 7,985,030,881
5. Step 5: Solve for x
   x = 7,985,030,881/66,988
6. Step 6: Final answer
   x = 119,200.91