Finding the Fourth Proportional to 2,580.30, 3,869.91 and 847.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.30 : 3,869.91 = 847.98 : x
2. Step 2: Convert to fraction form
   2,580.30/3,869.91 = 847.98/x
3. Step 3: Cross multiply
   2,580.30x = 3,869.91 × 847.98
4. Step 4: Simplify right side
   2,580.30x = 3,281,606.28
5. Step 5: Solve for x
   x = 3,281,606.28/2,580.30
6. Step 6: Final answer
   x = 1,271.79