Finding the Third Proportional to 658,784 and 1,438,040

Step by Step Solution

1. Step 1: Write the proportion equation
   658,784 : 1,438,040 = 1,438,040 : x
2. Step 2: Convert to fraction form
   658,784/1,438,040 = 1,438,040/x
3. Step 3: Cross multiply
   658,784x = 1,438,040 × 1,438,040
4. Step 4: Simplify right side
   658,784x = 2,067,959,041,600
5. Step 5: Solve for x
   x = 2,067,959,041,600/658,784
6. Step 6: Final answer
   x = 3,139,054.75