Finding the Fourth Proportional to 23,128, 31,916.64 and 13,192

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128 : 31,916.64 = 13,192 : x
2. Step 2: Convert to fraction form
   23,128/31,916.64 = 13,192/x
3. Step 3: Cross multiply
   23,128x = 31,916.64 × 13,192
4. Step 4: Simplify right side
   23,128x = 421,044,314.88
5. Step 5: Solve for x
   x = 421,044,314.88/23,128
6. Step 6: Final answer
   x = 18,204.96