Finding the Fourth Proportional to 3,870.99, 5,808.51 and 2,117.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.99 : 5,808.51 = 2,117.25 : x
2. Step 2: Convert to fraction form
   3,870.99/5,808.51 = 2,117.25/x
3. Step 3: Cross multiply
   3,870.99x = 5,808.51 × 2,117.25
4. Step 4: Simplify right side
   3,870.99x = 12,298,067.80
5. Step 5: Solve for x
   x = 12,298,067.80/3,870.99
6. Step 6: Final answer
   x = 3,176.98