Finding the Fourth Proportional to 3,865.32, 5,788.71 and 2,216.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,865.32 : 5,788.71 = 2,216.88 : x
2. Step 2: Convert to fraction form
   3,865.32/5,788.71 = 2,216.88/x
3. Step 3: Cross multiply
   3,865.32x = 5,788.71 × 2,216.88
4. Step 4: Simplify right side
   3,865.32x = 12,832,875.42
5. Step 5: Solve for x
   x = 12,832,875.42/3,865.32
6. Step 6: Final answer
   x = 3,320.00