Finding the Fourth Proportional to 1,383.20, 2,064.82 and 1,281.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.20 : 2,064.82 = 1,281.86 : x
2. Step 2: Convert to fraction form
   1,383.20/2,064.82 = 1,281.86/x
3. Step 3: Cross multiply
   1,383.20x = 2,064.82 × 1,281.86
4. Step 4: Simplify right side
   1,383.20x = 2,646,810.17
5. Step 5: Solve for x
   x = 2,646,810.17/1,383.20
6. Step 6: Final answer
   x = 1,913.54