Finding the Fourth Proportional to 15,443.24, 21,300.39 and 9,778.91

Step by Step Solution

1. Step 1: Write the proportion equation
   15,443.24 : 21,300.39 = 9,778.91 : x
2. Step 2: Convert to fraction form
   15,443.24/21,300.39 = 9,778.91/x
3. Step 3: Cross multiply
   15,443.24x = 21,300.39 × 9,778.91
4. Step 4: Simplify right side
   15,443.24x = 208,294,490.27
5. Step 5: Solve for x
   x = 208,294,490.27/15,443.24
6. Step 6: Final answer
   x = 13,487.75