Finding the Fourth Proportional to 15,123.24, 20,870.15 and 9,153.41

Step by Step Solution

1. Step 1: Write the proportion equation
   15,123.24 : 20,870.15 = 9,153.41 : x
2. Step 2: Convert to fraction form
   15,123.24/20,870.15 = 9,153.41/x
3. Step 3: Cross multiply
   15,123.24x = 20,870.15 × 9,153.41
4. Step 4: Simplify right side
   15,123.24x = 191,033,114.77
5. Step 5: Solve for x
   x = 191,033,114.77/15,123.24
6. Step 6: Final answer
   x = 12,631.76