Finding the Fourth Proportional to 9,871.12, 13,621.72 and 5,395.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,871.12 : 13,621.72 = 5,395.02 : x
2. Step 2: Convert to fraction form
   9,871.12/13,621.72 = 5,395.02/x
3. Step 3: Cross multiply
   9,871.12x = 13,621.72 × 5,395.02
4. Step 4: Simplify right side
   9,871.12x = 73,489,474.00
5. Step 5: Solve for x
   x = 73,489,474.00/9,871.12
6. Step 6: Final answer
   x = 7,444.90