Finding the Fourth Proportional to 11,008.61, 16,513.88 and 3,111.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,008.61 : 16,513.88 = 3,111.18 : x
2. Step 2: Convert to fraction form
   11,008.61/16,513.88 = 3,111.18/x
3. Step 3: Cross multiply
   11,008.61x = 16,513.88 × 3,111.18
4. Step 4: Simplify right side
   11,008.61x = 51,377,575.70
5. Step 5: Solve for x
   x = 51,377,575.70/11,008.61
6. Step 6: Final answer
   x = 4,667.04