Finding the Third Proportional to 399,068 and 867,960

Step by Step Solution

1. Step 1: Write the proportion equation
   399,068 : 867,960 = 867,960 : x
2. Step 2: Convert to fraction form
   399,068/867,960 = 867,960/x
3. Step 3: Cross multiply
   399,068x = 867,960 × 867,960
4. Step 4: Simplify right side
   399,068x = 753,354,561,600
5. Step 5: Solve for x
   x = 753,354,561,600/399,068
6. Step 6: Final answer
   x = 1,887,784.94