Finding the Fourth Proportional to 12,963.72, 19,429.40 and 5,559.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,963.72 : 19,429.40 = 5,559.60 : x
2. Step 2: Convert to fraction form
   12,963.72/19,429.40 = 5,559.60/x
3. Step 3: Cross multiply
   12,963.72x = 19,429.40 × 5,559.60
4. Step 4: Simplify right side
   12,963.72x = 108,019,779.00
5. Step 5: Solve for x
   x = 108,019,779.00/12,963.72
6. Step 6: Final answer
   x = 8,332.47