Finding the Fourth Proportional to 1,383.21, 1,910.93 and 1,069.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.21 : 1,910.93 = 1,069.74 : x
2. Step 2: Convert to fraction form
   1,383.21/1,910.93 = 1,069.74/x
3. Step 3: Cross multiply
   1,383.21x = 1,910.93 × 1,069.74
4. Step 4: Simplify right side
   1,383.21x = 2,044,192.91
5. Step 5: Solve for x
   x = 2,044,192.91/1,383.21
6. Step 6: Final answer
   x = 1,477.86