Finding the Fourth Proportional to 13,191.72, 19,789.98 and 4,426.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,191.72 : 19,789.98 = 4,426.68 : x
2. Step 2: Convert to fraction form
   13,191.72/19,789.98 = 4,426.68/x
3. Step 3: Cross multiply
   13,191.72x = 19,789.98 × 4,426.68
4. Step 4: Simplify right side
   13,191.72x = 87,603,908.67
5. Step 5: Solve for x
   x = 87,603,908.67/13,191.72
6. Step 6: Final answer
   x = 6,640.83