Finding the Fourth Proportional to 1,086.64, 1,626.90 and 845.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.64 : 1,626.90 = 845.98 : x
2. Step 2: Convert to fraction form
   1,086.64/1,626.90 = 845.98/x
3. Step 3: Cross multiply
   1,086.64x = 1,626.90 × 845.98
4. Step 4: Simplify right side
   1,086.64x = 1,376,324.86
5. Step 5: Solve for x
   x = 1,376,324.86/1,086.64
6. Step 6: Final answer
   x = 1,266.59