Finding the Third Proportional to 399,022.50 and 875,581.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,022.50 : 875,581.50 = 875,581.50 : x
2. Step 2: Convert to fraction form
   399,022.50/875,581.50 = 875,581.50/x
3. Step 3: Cross multiply
   399,022.50x = 875,581.50 × 875,581.50
4. Step 4: Simplify right side
   399,022.50x = 766,642,963,142.25
5. Step 5: Solve for x
   x = 766,642,963,142.25/399,022.50
6. Step 6: Final answer
   x = 1,921,302.59