Finding the Fourth Proportional to 1,391.86, 2,084.70 and 1,283.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.86 : 2,084.70 = 1,283.82 : x
2. Step 2: Convert to fraction form
   1,391.86/2,084.70 = 1,283.82/x
3. Step 3: Cross multiply
   1,391.86x = 2,084.70 × 1,283.82
4. Step 4: Simplify right side
   1,391.86x = 2,676,379.55
5. Step 5: Solve for x
   x = 2,676,379.55/1,391.86
6. Step 6: Final answer
   x = 1,922.88