Finding the Fourth Proportional to 23,123.92, 31,910.72 and 12,915.12

Step by Step Solution

1. Step 1: Write the proportion equation
   23,123.92 : 31,910.72 = 12,915.12 : x
2. Step 2: Convert to fraction form
   23,123.92/31,910.72 = 12,915.12/x
3. Step 3: Cross multiply
   23,123.92x = 31,910.72 × 12,915.12
4. Step 4: Simplify right side
   23,123.92x = 412,130,778.09
5. Step 5: Solve for x
   x = 412,130,778.09/23,123.92
6. Step 6: Final answer
   x = 17,822.70