Finding the Fourth Proportional to 9,885.59, 13,642.12 and 5,409.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,885.59 : 13,642.12 = 5,409.38 : x
2. Step 2: Convert to fraction form
   9,885.59/13,642.12 = 5,409.38/x
3. Step 3: Cross multiply
   9,885.59x = 13,642.12 × 5,409.38
4. Step 4: Simplify right side
   9,885.59x = 73,795,451.95
5. Step 5: Solve for x
   x = 73,795,451.95/9,885.59
6. Step 6: Final answer
   x = 7,464.95