Finding the Fourth Proportional to 15,510.30, 21,403.58 and 8,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.30 : 21,403.58 = 8,436.72 : x
2. Step 2: Convert to fraction form
   15,510.30/21,403.58 = 8,436.72/x
3. Step 3: Cross multiply
   15,510.30x = 21,403.58 × 8,436.72
4. Step 4: Simplify right side
   15,510.30x = 180,576,011.46
5. Step 5: Solve for x
   x = 180,576,011.46/15,510.30
6. Step 6: Final answer
   x = 11,642.33