Finding the Fourth Proportional to 2,211.30, 3,051.68 and 1,216.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.30 : 3,051.68 = 1,216.55 : x
2. Step 2: Convert to fraction form
   2,211.30/3,051.68 = 1,216.55/x
3. Step 3: Cross multiply
   2,211.30x = 3,051.68 × 1,216.55
4. Step 4: Simplify right side
   2,211.30x = 3,712,522.85
5. Step 5: Solve for x
   x = 3,712,522.85/2,211.30
6. Step 6: Final answer
   x = 1,678.89