Finding the Fourth Proportional to 9,867.72, 13,618.64 and 5,619.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,867.72 : 13,618.64 = 5,619.80 : x
2. Step 2: Convert to fraction form
   9,867.72/13,618.64 = 5,619.80/x
3. Step 3: Cross multiply
   9,867.72x = 13,618.64 × 5,619.80
4. Step 4: Simplify right side
   9,867.72x = 76,534,033.07
5. Step 5: Solve for x
   x = 76,534,033.07/9,867.72
6. Step 6: Final answer
   x = 7,756.00