Finding the Fourth Proportional to 22,478.10, 31,019.54 and 12,406.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,478.10 : 31,019.54 = 12,406.30 : x
2. Step 2: Convert to fraction form
   22,478.10/31,019.54 = 12,406.30/x
3. Step 3: Cross multiply
   22,478.10x = 31,019.54 × 12,406.30
4. Step 4: Simplify right side
   22,478.10x = 384,837,719.10
5. Step 5: Solve for x
   x = 384,837,719.10/22,478.10
6. Step 6: Final answer
   x = 17,120.56