Finding the Third Proportional to 66,613.50 and 143,109

Step by Step Solution

1. Step 1: Write the proportion equation
   66,613.50 : 143,109 = 143,109 : x
2. Step 2: Convert to fraction form
   66,613.50/143,109 = 143,109/x
3. Step 3: Cross multiply
   66,613.50x = 143,109 × 143,109
4. Step 4: Simplify right side
   66,613.50x = 20,480,185,881
5. Step 5: Solve for x
   x = 20,480,185,881/66,613.50
6. Step 6: Final answer
   x = 307,447.98