Finding the Fourth Proportional to 9,870.42, 14,815.89 and 5,718.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.42 : 14,815.89 = 5,718.54 : x
2. Step 2: Convert to fraction form
   9,870.42/14,815.89 = 5,718.54/x
3. Step 3: Cross multiply
   9,870.42x = 14,815.89 × 5,718.54
4. Step 4: Simplify right side
   9,870.42x = 84,725,315.16
5. Step 5: Solve for x
   x = 84,725,315.16/9,870.42
6. Step 6: Final answer
   x = 8,583.76