Finding the Fourth Proportional to 7,870.52, 10,866.54 and 4,890.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.52 : 10,866.54 = 4,890.80 : x
2. Step 2: Convert to fraction form
   7,870.52/10,866.54 = 4,890.80/x
3. Step 3: Cross multiply
   7,870.52x = 10,866.54 × 4,890.80
4. Step 4: Simplify right side
   7,870.52x = 53,146,073.83
5. Step 5: Solve for x
   x = 53,146,073.83/7,870.52
6. Step 6: Final answer
   x = 6,752.55