Finding the Fourth Proportional to 15,478.10, 21,359.82 and 8,404.37

Step by Step Solution

1. Step 1: Write the proportion equation
   15,478.10 : 21,359.82 = 8,404.37 : x
2. Step 2: Convert to fraction form
   15,478.10/21,359.82 = 8,404.37/x
3. Step 3: Cross multiply
   15,478.10x = 21,359.82 × 8,404.37
4. Step 4: Simplify right side
   15,478.10x = 179,515,723.61
5. Step 5: Solve for x
   x = 179,515,723.61/15,478.10
6. Step 6: Final answer
   x = 11,598.05