Finding the Fourth Proportional to 9,856.63, 13,601.91 and 5,380.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.63 : 13,601.91 = 5,380.48 : x
2. Step 2: Convert to fraction form
   9,856.63/13,601.91 = 5,380.48/x
3. Step 3: Cross multiply
   9,856.63x = 13,601.91 × 5,380.48
4. Step 4: Simplify right side
   9,856.63x = 73,184,804.72
5. Step 5: Solve for x
   x = 73,184,804.72/9,856.63
6. Step 6: Final answer
   x = 7,424.93