Finding the Fourth Proportional to 2,111.16, 2,913.40 and 1,227.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.16 : 2,913.40 = 1,227.05 : x
2. Step 2: Convert to fraction form
   2,111.16/2,913.40 = 1,227.05/x
3. Step 3: Cross multiply
   2,111.16x = 2,913.40 × 1,227.05
4. Step 4: Simplify right side
   2,111.16x = 3,574,885.36
5. Step 5: Solve for x
   x = 3,574,885.36/2,111.16
6. Step 6: Final answer
   x = 1,693.32