Finding the Fourth Proportional to 15,510.42, 21,404.39 and 8,436.83

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.42 : 21,404.39 = 8,436.83 : x
2. Step 2: Convert to fraction form
   15,510.42/21,404.39 = 8,436.83/x
3. Step 3: Cross multiply
   15,510.42x = 21,404.39 × 8,436.83
4. Step 4: Simplify right side
   15,510.42x = 180,585,050.48
5. Step 5: Solve for x
   x = 180,585,050.48/15,510.42
6. Step 6: Final answer
   x = 11,642.82