Finding the Fourth Proportional to 9,278.34, 12,804.21 and 5,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,278.34 : 12,804.21 = 5,086.50 : x
2. Step 2: Convert to fraction form
   9,278.34/12,804.21 = 5,086.50/x
3. Step 3: Cross multiply
   9,278.34x = 12,804.21 × 5,086.50
4. Step 4: Simplify right side
   9,278.34x = 65,128,614.17
5. Step 5: Solve for x
   x = 65,128,614.17/9,278.34
6. Step 6: Final answer
   x = 7,019.43