Finding the Fourth Proportional to 10,485.42, 15,718.77 and 3,911.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,485.42 : 15,718.77 = 3,911.91 : x
2. Step 2: Convert to fraction form
   10,485.42/15,718.77 = 3,911.91/x
3. Step 3: Cross multiply
   10,485.42x = 15,718.77 × 3,911.91
4. Step 4: Simplify right side
   10,485.42x = 61,490,413.55
5. Step 5: Solve for x
   x = 61,490,413.55/10,485.42
6. Step 6: Final answer
   x = 5,864.37