Finding the Fourth Proportional to 11,685.82, 17,516.58 and 5,110.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,685.82 : 17,516.58 = 5,110.78 : x
2. Step 2: Convert to fraction form
   11,685.82/17,516.58 = 5,110.78/x
3. Step 3: Cross multiply
   11,685.82x = 17,516.58 × 5,110.78
4. Step 4: Simplify right side
   11,685.82x = 89,523,386.73
5. Step 5: Solve for x
   x = 89,523,386.73/11,685.82
6. Step 6: Final answer
   x = 7,660.86