Finding the Third Proportional to 399,001.50 and 875,520

Step by Step Solution

1. Step 1: Write the proportion equation
   399,001.50 : 875,520 = 875,520 : x
2. Step 2: Convert to fraction form
   399,001.50/875,520 = 875,520/x
3. Step 3: Cross multiply
   399,001.50x = 875,520 × 875,520
4. Step 4: Simplify right side
   399,001.50x = 766,535,270,400
5. Step 5: Solve for x
   x = 766,535,270,400/399,001.50
6. Step 6: Final answer
   x = 1,921,133.81