Finding the Fourth Proportional to 9,885.72, 13,642.38 and 5,409.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,885.72 : 13,642.38 = 5,409.54 : x
2. Step 2: Convert to fraction form
   9,885.72/13,642.38 = 5,409.54/x
3. Step 3: Cross multiply
   9,885.72x = 13,642.38 × 5,409.54
4. Step 4: Simplify right side
   9,885.72x = 73,799,000.31
5. Step 5: Solve for x
   x = 73,799,000.31/9,885.72
6. Step 6: Final answer
   x = 7,465.21