Finding the Fourth Proportional to 7,870.72, 10,866.60 and 4,890.96

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.72 : 10,866.60 = 4,890.96 : x
2. Step 2: Convert to fraction form
   7,870.72/10,866.60 = 4,890.96/x
3. Step 3: Cross multiply
   7,870.72x = 10,866.60 × 4,890.96
4. Step 4: Simplify right side
   7,870.72x = 53,148,105.94
5. Step 5: Solve for x
   x = 53,148,105.94/7,870.72
6. Step 6: Final answer
   x = 6,752.64