Finding the Fourth Proportional to 11,859.60, 17,789.71 and 5,618.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,859.60 : 17,789.71 = 5,618.15 : x
2. Step 2: Convert to fraction form
   11,859.60/17,789.71 = 5,618.15/x
3. Step 3: Cross multiply
   11,859.60x = 17,789.71 × 5,618.15
4. Step 4: Simplify right side
   11,859.60x = 99,945,156.24
5. Step 5: Solve for x
   x = 99,945,156.24/11,859.60
6. Step 6: Final answer
   x = 8,427.36