Finding the Fourth Proportional to 14,078.24, 21,123 and 5,315.64

Step by Step Solution

1. Step 1: Write the proportion equation
   14,078.24 : 21,123 = 5,315.64 : x
2. Step 2: Convert to fraction form
   14,078.24/21,123 = 5,315.64/x
3. Step 3: Cross multiply
   14,078.24x = 21,123 × 5,315.64
4. Step 4: Simplify right side
   14,078.24x = 112,282,263.72
5. Step 5: Solve for x
   x = 112,282,263.72/14,078.24
6. Step 6: Final answer
   x = 7,975.59