Finding the Third Proportional to 28,428.50 and 42,643

Step by Step Solution

1. Step 1: Write the proportion equation
   28,428.50 : 42,643 = 42,643 : x
2. Step 2: Convert to fraction form
   28,428.50/42,643 = 42,643/x
3. Step 3: Cross multiply
   28,428.50x = 42,643 × 42,643
4. Step 4: Simplify right side
   28,428.50x = 1,818,425,449
5. Step 5: Solve for x
   x = 1,818,425,449/28,428.50
6. Step 6: Final answer
   x = 63,964.88