Finding the Fourth Proportional to 10,386.17, 15,578.75 and 3,811.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,386.17 : 15,578.75 = 3,811.86 : x
2. Step 2: Convert to fraction form
   10,386.17/15,578.75 = 3,811.86/x
3. Step 3: Cross multiply
   10,386.17x = 15,578.75 × 3,811.86
4. Step 4: Simplify right side
   10,386.17x = 59,384,002.06
5. Step 5: Solve for x
   x = 59,384,002.06/10,386.17
6. Step 6: Final answer
   x = 5,717.60