Finding the Fourth Proportional to 8,928.72, 13,381.56 and 7,884.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,928.72 : 13,381.56 = 7,884.72 : x
2. Step 2: Convert to fraction form
   8,928.72/13,381.56 = 7,884.72/x
3. Step 3: Cross multiply
   8,928.72x = 13,381.56 × 7,884.72
4. Step 4: Simplify right side
   8,928.72x = 105,509,853.76
5. Step 5: Solve for x
   x = 105,509,853.76/8,928.72
6. Step 6: Final answer
   x = 11,816.91