Finding the Fourth Proportional to 2,209.12, 3,314.72 and 1,113.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.12 : 3,314.72 = 1,113.60 : x
2. Step 2: Convert to fraction form
   2,209.12/3,314.72 = 1,113.60/x
3. Step 3: Cross multiply
   2,209.12x = 3,314.72 × 1,113.60
4. Step 4: Simplify right side
   2,209.12x = 3,691,272.19
5. Step 5: Solve for x
   x = 3,691,272.19/2,209.12
6. Step 6: Final answer
   x = 1,670.92