Finding the Fourth Proportional to 22,478.23, 31,019.34 and 12,405.93

Step by Step Solution

1. Step 1: Write the proportion equation
   22,478.23 : 31,019.34 = 12,405.93 : x
2. Step 2: Convert to fraction form
   22,478.23/31,019.34 = 12,405.93/x
3. Step 3: Cross multiply
   22,478.23x = 31,019.34 × 12,405.93
4. Step 4: Simplify right side
   22,478.23x = 384,823,935.17
5. Step 5: Solve for x
   x = 384,823,935.17/22,478.23
6. Step 6: Final answer
   x = 17,119.85