Finding the Fourth Proportional to 12,865.72, 19,307.79 and 5,475.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865.72 : 19,307.79 = 5,475.37 : x
2. Step 2: Convert to fraction form
   12,865.72/19,307.79 = 5,475.37/x
3. Step 3: Cross multiply
   12,865.72x = 19,307.79 × 5,475.37
4. Step 4: Simplify right side
   12,865.72x = 105,717,197.59
5. Step 5: Solve for x
   x = 105,717,197.59/12,865.72
6. Step 6: Final answer
   x = 8,216.97