Finding the Fourth Proportional to 23,128.16, 31,916.34 and 13,056.68

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.16 : 31,916.34 = 13,056.68 : x
2. Step 2: Convert to fraction form
   23,128.16/31,916.34 = 13,056.68/x
3. Step 3: Cross multiply
   23,128.16x = 31,916.34 × 13,056.68
4. Step 4: Simplify right side
   23,128.16x = 416,721,438.15
5. Step 5: Solve for x
   x = 416,721,438.15/23,128.16
6. Step 6: Final answer
   x = 18,017.92