Finding the Fourth Proportional to 1,385.08, 2,076.72 and 691.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.08 : 2,076.72 = 691.54 : x
2. Step 2: Convert to fraction form
   1,385.08/2,076.72 = 691.54/x
3. Step 3: Cross multiply
   1,385.08x = 2,076.72 × 691.54
4. Step 4: Simplify right side
   1,385.08x = 1,436,134.95
5. Step 5: Solve for x
   x = 1,436,134.95/1,385.08
6. Step 6: Final answer
   x = 1,036.86