Finding the Third Proportional to 409,990.50 and 900,697.50

Step by Step Solution

1. Step 1: Write the proportion equation
   409,990.50 : 900,697.50 = 900,697.50 : x
2. Step 2: Convert to fraction form
   409,990.50/900,697.50 = 900,697.50/x
3. Step 3: Cross multiply
   409,990.50x = 900,697.50 × 900,697.50
4. Step 4: Simplify right side
   409,990.50x = 811,255,986,506.25
5. Step 5: Solve for x
   x = 811,255,986,506.25/409,990.50
6. Step 6: Final answer
   x = 1,978,718.99