Finding the Fourth Proportional to 15,510.58, 21,404.42 and 8,436.84

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.58 : 21,404.42 = 8,436.84 : x
2. Step 2: Convert to fraction form
   15,510.58/21,404.42 = 8,436.84/x
3. Step 3: Cross multiply
   15,510.58x = 21,404.42 × 8,436.84
4. Step 4: Simplify right side
   15,510.58x = 180,585,666.83
5. Step 5: Solve for x
   x = 180,585,666.83/15,510.58
6. Step 6: Final answer
   x = 11,642.74