Finding the Fourth Proportional to 2,211.40, 3,051.61 and 1,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.40 : 3,051.61 = 1,216.72 : x
2. Step 2: Convert to fraction form
   2,211.40/3,051.61 = 1,216.72/x
3. Step 3: Cross multiply
   2,211.40x = 3,051.61 × 1,216.72
4. Step 4: Simplify right side
   2,211.40x = 3,712,954.92
5. Step 5: Solve for x
   x = 3,712,954.92/2,211.40
6. Step 6: Final answer
   x = 1,679.01