Finding the Fourth Proportional to 2,113.80, 2,916.78 and 1,229.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.80 : 2,916.78 = 1,229.46 : x
2. Step 2: Convert to fraction form
   2,113.80/2,916.78 = 1,229.46/x
3. Step 3: Cross multiply
   2,113.80x = 2,916.78 × 1,229.46
4. Step 4: Simplify right side
   2,113.80x = 3,586,064.34
5. Step 5: Solve for x
   x = 3,586,064.34/2,113.80
6. Step 6: Final answer
   x = 1,696.50