Finding the Fourth Proportional to 15,510.51, 21,404.41 and 8,436.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,510.51 : 21,404.41 = 8,436.96 : x
2. Step 2: Convert to fraction form
   15,510.51/21,404.41 = 8,436.96/x
3. Step 3: Cross multiply
   15,510.51x = 21,404.41 × 8,436.96
4. Step 4: Simplify right side
   15,510.51x = 180,588,129.90
5. Step 5: Solve for x
   x = 180,588,129.90/15,510.51
6. Step 6: Final answer
   x = 11,642.95