Finding the Third Proportional to 558,981 and 871,681.50

Step by Step Solution

1. Step 1: Write the proportion equation
   558,981 : 871,681.50 = 871,681.50 : x
2. Step 2: Convert to fraction form
   558,981/871,681.50 = 871,681.50/x
3. Step 3: Cross multiply
   558,981x = 871,681.50 × 871,681.50
4. Step 4: Simplify right side
   558,981x = 759,828,637,442.25
5. Step 5: Solve for x
   x = 759,828,637,442.25/558,981
6. Step 6: Final answer
   x = 1,359,310.31