Finding the Fourth Proportional to 13,287.84, 19,934.64 and 3,928.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,287.84 : 19,934.64 = 3,928.56 : x
2. Step 2: Convert to fraction form
   13,287.84/19,934.64 = 3,928.56/x
3. Step 3: Cross multiply
   13,287.84x = 19,934.64 × 3,928.56
4. Step 4: Simplify right side
   13,287.84x = 78,314,429.32
5. Step 5: Solve for x
   x = 78,314,429.32/13,287.84
6. Step 6: Final answer
   x = 5,893.69