Finding the Third Proportional to 66,545.50 and 143,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,545.50 : 143,499.50 = 143,499.50 : x
2. Step 2: Convert to fraction form
   66,545.50/143,499.50 = 143,499.50/x
3. Step 3: Cross multiply
   66,545.50x = 143,499.50 × 143,499.50
4. Step 4: Simplify right side
   66,545.50x = 20,592,106,500.25
5. Step 5: Solve for x
   x = 20,592,106,500.25/66,545.50
6. Step 6: Final answer
   x = 309,444.01