Finding the Fourth Proportional to 13,188.94, 19,782.72 and 3,328.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,188.94 : 19,782.72 = 3,328.31 : x
2. Step 2: Convert to fraction form
   13,188.94/19,782.72 = 3,328.31/x
3. Step 3: Cross multiply
   13,188.94x = 19,782.72 × 3,328.31
4. Step 4: Simplify right side
   13,188.94x = 65,843,024.80
5. Step 5: Solve for x
   x = 65,843,024.80/13,188.94
6. Step 6: Final answer
   x = 4,992.29