Finding the Third Proportional to 66,516.50 and 90,474.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,516.50 : 90,474.50 = 90,474.50 : x
2. Step 2: Convert to fraction form
   66,516.50/90,474.50 = 90,474.50/x
3. Step 3: Cross multiply
   66,516.50x = 90,474.50 × 90,474.50
4. Step 4: Simplify right side
   66,516.50x = 8,185,635,150.25
5. Step 5: Solve for x
   x = 8,185,635,150.25/66,516.50
6. Step 6: Final answer
   x = 123,061.72