Finding the Third Proportional to 66,438.56 and 89,510.06

Step by Step Solution

1. Step 1: Write the proportion equation
   66,438.56 : 89,510.06 = 89,510.06 : x
2. Step 2: Convert to fraction form
   66,438.56/89,510.06 = 89,510.06/x
3. Step 3: Cross multiply
   66,438.56x = 89,510.06 × 89,510.06
4. Step 4: Simplify right side
   66,438.56x = 8,012,051,288.75
5. Step 5: Solve for x
   x = 8,012,051,288.75/66,438.56
6. Step 6: Final answer
   x = 120,593.39