Finding the Third Proportional to 66,571.50 and 145,428

Step by Step Solution

1. Step 1: Write the proportion equation
   66,571.50 : 145,428 = 145,428 : x
2. Step 2: Convert to fraction form
   66,571.50/145,428 = 145,428/x
3. Step 3: Cross multiply
   66,571.50x = 145,428 × 145,428
4. Step 4: Simplify right side
   66,571.50x = 21,149,303,184
5. Step 5: Solve for x
   x = 21,149,303,184/66,571.50
6. Step 6: Final answer
   x = 317,693.05