Finding the Fourth Proportional to 2,211.59, 3,051.88 and 1,216.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.59 : 3,051.88 = 1,216.71 : x
2. Step 2: Convert to fraction form
   2,211.59/3,051.88 = 1,216.71/x
3. Step 3: Cross multiply
   2,211.59x = 3,051.88 × 1,216.71
4. Step 4: Simplify right side
   2,211.59x = 3,713,249.87
5. Step 5: Solve for x
   x = 3,713,249.87/2,211.59
6. Step 6: Final answer
   x = 1,678.99