Finding the Fourth Proportional to 18,123.30, 27,152.55 and 15,531.30

Step by Step Solution

1. Step 1: Write the proportion equation
   18,123.30 : 27,152.55 = 15,531.30 : x
2. Step 2: Convert to fraction form
   18,123.30/27,152.55 = 15,531.30/x
3. Step 3: Cross multiply
   18,123.30x = 27,152.55 × 15,531.30
4. Step 4: Simplify right side
   18,123.30x = 421,714,399.82
5. Step 5: Solve for x
   x = 421,714,399.82/18,123.30
6. Step 6: Final answer
   x = 23,269.18