Finding the Fourth Proportional to 9,368.56, 12,928.20 and 5,176.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,368.56 : 12,928.20 = 5,176.72 : x
2. Step 2: Convert to fraction form
   9,368.56/12,928.20 = 5,176.72/x
3. Step 3: Cross multiply
   9,368.56x = 12,928.20 × 5,176.72
4. Step 4: Simplify right side
   9,368.56x = 66,925,671.50
5. Step 5: Solve for x
   x = 66,925,671.50/9,368.56
6. Step 6: Final answer
   x = 7,143.65