Finding the Fourth Proportional to 15,510.06, 21,404.10 and 8,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.06 : 21,404.10 = 8,436.50 : x
2. Step 2: Convert to fraction form
   15,510.06/21,404.10 = 8,436.50/x
3. Step 3: Cross multiply
   15,510.06x = 21,404.10 × 8,436.50
4. Step 4: Simplify right side
   15,510.06x = 180,575,689.65
5. Step 5: Solve for x
   x = 180,575,689.65/15,510.06
6. Step 6: Final answer
   x = 11,642.49