Finding the Fourth Proportional to 2,211.55, 3,314.58 and 1,115.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.55 : 3,314.58 = 1,115.31 : x
2. Step 2: Convert to fraction form
   2,211.55/3,314.58 = 1,115.31/x
3. Step 3: Cross multiply
   2,211.55x = 3,314.58 × 1,115.31
4. Step 4: Simplify right side
   2,211.55x = 3,696,784.22
5. Step 5: Solve for x
   x = 3,696,784.22/2,211.55
6. Step 6: Final answer
   x = 1,671.58