Finding the Fourth Proportional to 13,328.96, 19,987.20 and 3,965.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,328.96 : 19,987.20 = 3,965.52 : x
2. Step 2: Convert to fraction form
   13,328.96/19,987.20 = 3,965.52/x
3. Step 3: Cross multiply
   13,328.96x = 19,987.20 × 3,965.52
4. Step 4: Simplify right side
   13,328.96x = 79,259,641.34
5. Step 5: Solve for x
   x = 79,259,641.34/13,328.96
6. Step 6: Final answer
   x = 5,946.42