Finding the Third Proportional to 389,612 and 584,428

Step by Step Solution

1. Step 1: Write the proportion equation
   389,612 : 584,428 = 584,428 : x
2. Step 2: Convert to fraction form
   389,612/584,428 = 584,428/x
3. Step 3: Cross multiply
   389,612x = 584,428 × 584,428
4. Step 4: Simplify right side
   389,612x = 341,556,087,184
5. Step 5: Solve for x
   x = 341,556,087,184/389,612
6. Step 6: Final answer
   x = 876,657.00