Finding the Fourth Proportional to 2,216.76, 3,059.01 and 1,221.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.76 : 3,059.01 = 1,221.84 : x
2. Step 2: Convert to fraction form
   2,216.76/3,059.01 = 1,221.84/x
3. Step 3: Cross multiply
   2,216.76x = 3,059.01 × 1,221.84
4. Step 4: Simplify right side
   2,216.76x = 3,737,620.78
5. Step 5: Solve for x
   x = 3,737,620.78/2,216.76
6. Step 6: Final answer
   x = 1,686.07