Finding the Fourth Proportional to 9,311.89, 12,848.73 and 5,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,311.89 : 12,848.73 = 5,278.72 : x
2. Step 2: Convert to fraction form
   9,311.89/12,848.73 = 5,278.72/x
3. Step 3: Cross multiply
   9,311.89x = 12,848.73 × 5,278.72
4. Step 4: Simplify right side
   9,311.89x = 67,824,848.03
5. Step 5: Solve for x
   x = 67,824,848.03/9,311.89
6. Step 6: Final answer
   x = 7,283.68