Finding the Third Proportional to 399,429 and 869,382

Step by Step Solution

1. Step 1: Write the proportion equation
   399,429 : 869,382 = 869,382 : x
2. Step 2: Convert to fraction form
   399,429/869,382 = 869,382/x
3. Step 3: Cross multiply
   399,429x = 869,382 × 869,382
4. Step 4: Simplify right side
   399,429x = 755,825,061,924
5. Step 5: Solve for x
   x = 755,825,061,924/399,429
6. Step 6: Final answer
   x = 1,892,263.86