Finding the Third Proportional to 399,305.25 and 865,983

Step by Step Solution

1. Step 1: Write the proportion equation
   399,305.25 : 865,983 = 865,983 : x
2. Step 2: Convert to fraction form
   399,305.25/865,983 = 865,983/x
3. Step 3: Cross multiply
   399,305.25x = 865,983 × 865,983
4. Step 4: Simplify right side
   399,305.25x = 749,926,556,289
5. Step 5: Solve for x
   x = 749,926,556,289/399,305.25
6. Step 6: Final answer
   x = 1,878,078.38