Finding the Fourth Proportional to 22,477.58, 31,020.48 and 12,920.53

Step by Step Solution

1. Step 1: Write the proportion equation
   22,477.58 : 31,020.48 = 12,920.53 : x
2. Step 2: Convert to fraction form
   22,477.58/31,020.48 = 12,920.53/x
3. Step 3: Cross multiply
   22,477.58x = 31,020.48 × 12,920.53
4. Step 4: Simplify right side
   22,477.58x = 400,800,964.90
5. Step 5: Solve for x
   x = 400,800,964.90/22,477.58
6. Step 6: Final answer
   x = 17,831.14