Finding the Fourth Proportional to 10,388.18, 15,581.74 and 3,813.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,388.18 : 15,581.74 = 3,813.86 : x
2. Step 2: Convert to fraction form
   10,388.18/15,581.74 = 3,813.86/x
3. Step 3: Cross multiply
   10,388.18x = 15,581.74 × 3,813.86
4. Step 4: Simplify right side
   10,388.18x = 59,426,574.92
5. Step 5: Solve for x
   x = 59,426,574.92/10,388.18
6. Step 6: Final answer
   x = 5,720.60