Finding the Fourth Proportional to 814,061.80, 1,221,151.01 and 215,016.99

Step by Step Solution

1. Step 1: Write the proportion equation
   814,061.80 : 1,221,151.01 = 215,016.99 : x
2. Step 2: Convert to fraction form
   814,061.80/1,221,151.01 = 215,016.99/x
3. Step 3: Cross multiply
   814,061.80x = 1,221,151.01 × 215,016.99
4. Step 4: Simplify right side
   814,061.80x = 262,568,207,324.82
5. Step 5: Solve for x
   x = 262,568,207,324.82/814,061.80
6. Step 6: Final answer
   x = 322,540.88