Finding the Fourth Proportional to 13,158.72, 19,739.32 and 4,394.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.72 : 19,739.32 = 4,394.24 : x
2. Step 2: Convert to fraction form
   13,158.72/19,739.32 = 4,394.24/x
3. Step 3: Cross multiply
   13,158.72x = 19,739.32 × 4,394.24
4. Step 4: Simplify right side
   13,158.72x = 86,739,309.52
5. Step 5: Solve for x
   x = 86,739,309.52/13,158.72
6. Step 6: Final answer
   x = 6,591.77