Finding the Third Proportional to 431,865 and 891,391.50

Step by Step Solution

1. Step 1: Write the proportion equation
   431,865 : 891,391.50 = 891,391.50 : x
2. Step 2: Convert to fraction form
   431,865/891,391.50 = 891,391.50/x
3. Step 3: Cross multiply
   431,865x = 891,391.50 × 891,391.50
4. Step 4: Simplify right side
   431,865x = 794,578,806,272.25
5. Step 5: Solve for x
   x = 794,578,806,272.25/431,865
6. Step 6: Final answer
   x = 1,839,877.75