Finding the Fourth Proportional to 220,441.01, 328,831.52 and 213,061.45

Step by Step Solution

1. Step 1: Write the proportion equation
   220,441.01 : 328,831.52 = 213,061.45 : x
2. Step 2: Convert to fraction form
   220,441.01/328,831.52 = 213,061.45/x
3. Step 3: Cross multiply
   220,441.01x = 328,831.52 × 213,061.45
4. Step 4: Simplify right side
   220,441.01x = 70,061,320,456.90
5. Step 5: Solve for x
   x = 70,061,320,456.90/220,441.01
6. Step 6: Final answer
   x = 317,823.44