Finding the Fourth Proportional to 15,478.26, 21,360.06 and 8,404.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,478.26 : 21,360.06 = 8,404.71 : x
2. Step 2: Convert to fraction form
   15,478.26/21,360.06 = 8,404.71/x
3. Step 3: Cross multiply
   15,478.26x = 21,360.06 × 8,404.71
4. Step 4: Simplify right side
   15,478.26x = 179,525,109.88
5. Step 5: Solve for x
   x = 179,525,109.88/15,478.26
6. Step 6: Final answer
   x = 11,598.53