Finding the Fourth Proportional to 23,127, 31,915.20 and 12,516.63

Step by Step Solution

1. Step 1: Write the proportion equation
   23,127 : 31,915.20 = 12,516.63 : x
2. Step 2: Convert to fraction form
   23,127/31,915.20 = 12,516.63/x
3. Step 3: Cross multiply
   23,127x = 31,915.20 × 12,516.63
4. Step 4: Simplify right side
   23,127x = 399,470,749.78
5. Step 5: Solve for x
   x = 399,470,749.78/23,127
6. Step 6: Final answer
   x = 17,272.92