Finding the Fourth Proportional to 9,278.30, 12,804.86 and 5,087.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,278.30 : 12,804.86 = 5,087.36 : x
2. Step 2: Convert to fraction form
   9,278.30/12,804.86 = 5,087.36/x
3. Step 3: Cross multiply
   9,278.30x = 12,804.86 × 5,087.36
4. Step 4: Simplify right side
   9,278.30x = 65,142,905.27
5. Step 5: Solve for x
   x = 65,142,905.27/9,278.30
6. Step 6: Final answer
   x = 7,021.00