Finding the Third Proportional to 389,088 and 714,240

Step by Step Solution

1. Step 1: Write the proportion equation
   389,088 : 714,240 = 714,240 : x
2. Step 2: Convert to fraction form
   389,088/714,240 = 714,240/x
3. Step 3: Cross multiply
   389,088x = 714,240 × 714,240
4. Step 4: Simplify right side
   389,088x = 510,138,777,600
5. Step 5: Solve for x
   x = 510,138,777,600/389,088
6. Step 6: Final answer
   x = 1,311,114.14