Finding the Fourth Proportional to 9,856.38, 13,601.72 and 5,380.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.38 : 13,601.72 = 5,380.18 : x
2. Step 2: Convert to fraction form
   9,856.38/13,601.72 = 5,380.18/x
3. Step 3: Cross multiply
   9,856.38x = 13,601.72 × 5,380.18
4. Step 4: Simplify right side
   9,856.38x = 73,179,701.91
5. Step 5: Solve for x
   x = 73,179,701.91/9,856.38
6. Step 6: Final answer
   x = 7,424.60