Finding the Fourth Proportional to 23,128.48, 31,917.07 and 13,056.70

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.48 : 31,917.07 = 13,056.70 : x
2. Step 2: Convert to fraction form
   23,128.48/31,917.07 = 13,056.70/x
3. Step 3: Cross multiply
   23,128.48x = 31,917.07 × 13,056.70
4. Step 4: Simplify right side
   23,128.48x = 416,731,542.59
5. Step 5: Solve for x
   x = 416,731,542.59/23,128.48
6. Step 6: Final answer
   x = 18,018.12