Finding the Third Proportional to 66,507 and 89,730

Step by Step Solution

1. Step 1: Write the proportion equation
   66,507 : 89,730 = 89,730 : x
2. Step 2: Convert to fraction form
   66,507/89,730 = 89,730/x
3. Step 3: Cross multiply
   66,507x = 89,730 × 89,730
4. Step 4: Simplify right side
   66,507x = 8,051,472,900
5. Step 5: Solve for x
   x = 8,051,472,900/66,507
6. Step 6: Final answer
   x = 121,062.04