Finding the Fourth Proportional to 9,856.31, 13,601.58 and 5,380.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.31 : 13,601.58 = 5,380.02 : x
2. Step 2: Convert to fraction form
   9,856.31/13,601.58 = 5,380.02/x
3. Step 3: Cross multiply
   9,856.31x = 13,601.58 × 5,380.02
4. Step 4: Simplify right side
   9,856.31x = 73,176,772.43
5. Step 5: Solve for x
   x = 73,176,772.43/9,856.31
6. Step 6: Final answer
   x = 7,424.36