Finding the Third Proportional to 66,538 and 89,931

Step by Step Solution

1. Step 1: Write the proportion equation
   66,538 : 89,931 = 89,931 : x
2. Step 2: Convert to fraction form
   66,538/89,931 = 89,931/x
3. Step 3: Cross multiply
   66,538x = 89,931 × 89,931
4. Step 4: Simplify right side
   66,538x = 8,087,584,761
5. Step 5: Solve for x
   x = 8,087,584,761/66,538
6. Step 6: Final answer
   x = 121,548.36