Finding the Third Proportional to 1,403,978 and 2,156,664

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403,978 : 2,156,664 = 2,156,664 : x
2. Step 2: Convert to fraction form
   1,403,978/2,156,664 = 2,156,664/x
3. Step 3: Cross multiply
   1,403,978x = 2,156,664 × 2,156,664
4. Step 4: Simplify right side
   1,403,978x = 4,651,199,608,896
5. Step 5: Solve for x
   x = 4,651,199,608,896/1,403,978
6. Step 6: Final answer
   x = 3,312,872.15