Finding the Fourth Proportional to 15,510.42, 21,404.43 and 8,436.84

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.42 : 21,404.43 = 8,436.84 : x
2. Step 2: Convert to fraction form
   15,510.42/21,404.43 = 8,436.84/x
3. Step 3: Cross multiply
   15,510.42x = 21,404.43 × 8,436.84
4. Step 4: Simplify right side
   15,510.42x = 180,585,751.20
5. Step 5: Solve for x
   x = 180,585,751.20/15,510.42
6. Step 6: Final answer
   x = 11,642.87