Finding the Fourth Proportional to 2,113.38, 2,916.18 and 1,228.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.38 : 2,916.18 = 1,228.50 : x
2. Step 2: Convert to fraction form
   2,113.38/2,916.18 = 1,228.50/x
3. Step 3: Cross multiply
   2,113.38x = 2,916.18 × 1,228.50
4. Step 4: Simplify right side
   2,113.38x = 3,582,527.13
5. Step 5: Solve for x
   x = 3,582,527.13/2,113.38
6. Step 6: Final answer
   x = 1,695.16