Finding the Third Proportional to 40,643 and 55,369

Step by Step Solution

1. Step 1: Write the proportion equation
   40,643 : 55,369 = 55,369 : x
2. Step 2: Convert to fraction form
   40,643/55,369 = 55,369/x
3. Step 3: Cross multiply
   40,643x = 55,369 × 55,369
4. Step 4: Simplify right side
   40,643x = 3,065,726,161
5. Step 5: Solve for x
   x = 3,065,726,161/40,643
6. Step 6: Final answer
   x = 75,430.61