Finding the Fourth Proportional to 13,306.42, 19,961.48 and 3,947.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,306.42 : 19,961.48 = 3,947.28 : x
2. Step 2: Convert to fraction form
   13,306.42/19,961.48 = 3,947.28/x
3. Step 3: Cross multiply
   13,306.42x = 19,961.48 × 3,947.28
4. Step 4: Simplify right side
   13,306.42x = 78,793,550.77
5. Step 5: Solve for x
   x = 78,793,550.77/13,306.42
6. Step 6: Final answer
   x = 5,921.47