Finding the Fourth Proportional to 814,061.55, 1,221,150.63 and 215,016.74

Step by Step Solution

1. Step 1: Write the proportion equation
   814,061.55 : 1,221,150.63 = 215,016.74 : x
2. Step 2: Convert to fraction form
   814,061.55/1,221,150.63 = 215,016.74/x
3. Step 3: Cross multiply
   814,061.55x = 1,221,150.63 × 215,016.74
4. Step 4: Simplify right side
   814,061.55x = 262,567,821,405.79
5. Step 5: Solve for x
   x = 262,567,821,405.79/814,061.55
6. Step 6: Final answer
   x = 322,540.50