Finding the Fourth Proportional to 2,453.73, 3,386.05 and 1,391.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.73 : 3,386.05 = 1,391.57 : x
2. Step 2: Convert to fraction form
   2,453.73/3,386.05 = 1,391.57/x
3. Step 3: Cross multiply
   2,453.73x = 3,386.05 × 1,391.57
4. Step 4: Simplify right side
   2,453.73x = 4,711,925.60
5. Step 5: Solve for x
   x = 4,711,925.60/2,453.73
6. Step 6: Final answer
   x = 1,920.31