Finding the Fourth Proportional to 9,278.96, 12,804.88 and 5,087.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,278.96 : 12,804.88 = 5,087.12 : x
2. Step 2: Convert to fraction form
   9,278.96/12,804.88 = 5,087.12/x
3. Step 3: Cross multiply
   9,278.96x = 12,804.88 × 5,087.12
4. Step 4: Simplify right side
   9,278.96x = 65,139,961.15
5. Step 5: Solve for x
   x = 65,139,961.15/9,278.96
6. Step 6: Final answer
   x = 7,020.18