Finding the Fourth Proportional to 9,885.47, 13,641.91 and 5,409.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,885.47 : 13,641.91 = 5,409.20 : x
2. Step 2: Convert to fraction form
   9,885.47/13,641.91 = 5,409.20/x
3. Step 3: Cross multiply
   9,885.47x = 13,641.91 × 5,409.20
4. Step 4: Simplify right side
   9,885.47x = 73,791,840.15
5. Step 5: Solve for x
   x = 73,791,840.15/9,885.47
6. Step 6: Final answer
   x = 7,464.68