Finding the Fourth Proportional to 22,477.60, 31,019.68 and 12,406.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,477.60 : 31,019.68 = 12,406.20 : x
2. Step 2: Convert to fraction form
   22,477.60/31,019.68 = 12,406.20/x
3. Step 3: Cross multiply
   22,477.60x = 31,019.68 × 12,406.20
4. Step 4: Simplify right side
   22,477.60x = 384,836,354.02
5. Step 5: Solve for x
   x = 384,836,354.02/22,477.60
6. Step 6: Final answer
   x = 17,120.88