Finding the Third Proportional to 465,780 and 721,428

Step by Step Solution

1. Step 1: Write the proportion equation
   465,780 : 721,428 = 721,428 : x
2. Step 2: Convert to fraction form
   465,780/721,428 = 721,428/x
3. Step 3: Cross multiply
   465,780x = 721,428 × 721,428
4. Step 4: Simplify right side
   465,780x = 520,458,359,184
5. Step 5: Solve for x
   x = 520,458,359,184/465,780
6. Step 6: Final answer
   x = 1,117,390.96