Finding the Fourth Proportional to 15,510.47, 21,404.55 and 8,436.95

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.47 : 21,404.55 = 8,436.95 : x
2. Step 2: Convert to fraction form
   15,510.47/21,404.55 = 8,436.95/x
3. Step 3: Cross multiply
   15,510.47x = 21,404.55 × 8,436.95
4. Step 4: Simplify right side
   15,510.47x = 180,589,011.10
5. Step 5: Solve for x
   x = 180,589,011.10/15,510.47
6. Step 6: Final answer
   x = 11,643.04