Finding the Fourth Proportional to 7,870.58, 10,857.92 and 4,880.42

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.58 : 10,857.92 = 4,880.42 : x
2. Step 2: Convert to fraction form
   7,870.58/10,857.92 = 4,880.42/x
3. Step 3: Cross multiply
   7,870.58x = 10,857.92 × 4,880.42
4. Step 4: Simplify right side
   7,870.58x = 52,991,209.93
5. Step 5: Solve for x
   x = 52,991,209.93/7,870.58
6. Step 6: Final answer
   x = 6,732.82