Finding the Fourth Proportional to 22,912.40, 31,618.24 and 12,840.93

Step by Step Solution

1. Step 1: Write the proportion equation
   22,912.40 : 31,618.24 = 12,840.93 : x
2. Step 2: Convert to fraction form
   22,912.40/31,618.24 = 12,840.93/x
3. Step 3: Cross multiply
   22,912.40x = 31,618.24 × 12,840.93
4. Step 4: Simplify right side
   22,912.40x = 406,007,574.46
5. Step 5: Solve for x
   x = 406,007,574.46/22,912.40
6. Step 6: Final answer
   x = 17,719.99