Finding the Fourth Proportional to 9,867.88, 13,618.62 and 5,392.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,867.88 : 13,618.62 = 5,392.31 : x
2. Step 2: Convert to fraction form
   9,867.88/13,618.62 = 5,392.31/x
3. Step 3: Cross multiply
   9,867.88x = 13,618.62 × 5,392.31
4. Step 4: Simplify right side
   9,867.88x = 73,435,820.81
5. Step 5: Solve for x
   x = 73,435,820.81/9,867.88
6. Step 6: Final answer
   x = 7,441.90