Finding the Third Proportional to 575,428.50 and 871,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   575,428.50 : 871,139.25 = 871,139.25 : x
2. Step 2: Convert to fraction form
   575,428.50/871,139.25 = 871,139.25/x
3. Step 3: Cross multiply
   575,428.50x = 871,139.25 × 871,139.25
4. Step 4: Simplify right side
   575,428.50x = 758,883,592,890.56
5. Step 5: Solve for x
   x = 758,883,592,890.56/575,428.50
6. Step 6: Final answer
   x = 1,318,814.75