Finding the Fourth Proportional to 11,916.18, 17,871.78 and 4,889.34

Step by Step Solution

1. Step 1: Write the proportion equation
   11,916.18 : 17,871.78 = 4,889.34 : x
2. Step 2: Convert to fraction form
   11,916.18/17,871.78 = 4,889.34/x
3. Step 3: Cross multiply
   11,916.18x = 17,871.78 × 4,889.34
4. Step 4: Simplify right side
   11,916.18x = 87,381,208.83
5. Step 5: Solve for x
   x = 87,381,208.83/11,916.18
6. Step 6: Final answer
   x = 7,332.99