Finding the Fourth Proportional to 11,918.63, 17,856.15 and 5,581.88

Step by Step Solution

1. Step 1: Write the proportion equation
   11,918.63 : 17,856.15 = 5,581.88 : x
2. Step 2: Convert to fraction form
   11,918.63/17,856.15 = 5,581.88/x
3. Step 3: Cross multiply
   11,918.63x = 17,856.15 × 5,581.88
4. Step 4: Simplify right side
   11,918.63x = 99,670,843.31
5. Step 5: Solve for x
   x = 99,670,843.31/11,918.63
6. Step 6: Final answer
   x = 8,362.61