Finding the Third Proportional to 658,840 and 1,438,160

Step by Step Solution

1. Step 1: Write the proportion equation
   658,840 : 1,438,160 = 1,438,160 : x
2. Step 2: Convert to fraction form
   658,840/1,438,160 = 1,438,160/x
3. Step 3: Cross multiply
   658,840x = 1,438,160 × 1,438,160
4. Step 4: Simplify right side
   658,840x = 2,068,304,185,600
5. Step 5: Solve for x
   x = 2,068,304,185,600/658,840
6. Step 6: Final answer
   x = 3,139,311.80