Finding the Fourth Proportional to 1,385.82, 2,079.27 and 1,272.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.82 : 2,079.27 = 1,272.42 : x
2. Step 2: Convert to fraction form
   1,385.82/2,079.27 = 1,272.42/x
3. Step 3: Cross multiply
   1,385.82x = 2,079.27 × 1,272.42
4. Step 4: Simplify right side
   1,385.82x = 2,645,704.73
5. Step 5: Solve for x
   x = 2,645,704.73/1,385.82
6. Step 6: Final answer
   x = 1,909.13