Finding the Fourth Proportional to 11,876.29, 17,815.01 and 3,111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   11,876.29 : 17,815.01 = 3,111.21 : x
2. Step 2: Convert to fraction form
   11,876.29/17,815.01 = 3,111.21/x
3. Step 3: Cross multiply
   11,876.29x = 17,815.01 × 3,111.21
4. Step 4: Simplify right side
   11,876.29x = 55,426,221.71
5. Step 5: Solve for x
   x = 55,426,221.71/11,876.29
6. Step 6: Final answer
   x = 4,666.97