Finding the Fourth Proportional to 2,111.19, 2,913.80 and 1,227.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.19 : 2,913.80 = 1,227.50 : x
2. Step 2: Convert to fraction form
   2,111.19/2,913.80 = 1,227.50/x
3. Step 3: Cross multiply
   2,111.19x = 2,913.80 × 1,227.50
4. Step 4: Simplify right side
   2,111.19x = 3,576,683.36
5. Step 5: Solve for x
   x = 3,576,683.36/2,111.19
6. Step 6: Final answer
   x = 1,694.16