Finding the Fourth Proportional to 23,059.76, 31,822.96 and 12,988

Step by Step Solution

1. Step 1: Write the proportion equation
   23,059.76 : 31,822.96 = 12,988 : x
2. Step 2: Convert to fraction form
   23,059.76/31,822.96 = 12,988/x
3. Step 3: Cross multiply
   23,059.76x = 31,822.96 × 12,988
4. Step 4: Simplify right side
   23,059.76x = 413,316,604.48
5. Step 5: Solve for x
   x = 413,316,604.48/23,059.76
6. Step 6: Final answer
   x = 17,923.72