Finding the Fourth Proportional to 1,442.00, 1,990.10 and 918

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.00 : 1,990.10 = 918 : x
2. Step 2: Convert to fraction form
   1,442.00/1,990.10 = 918/x
3. Step 3: Cross multiply
   1,442.00x = 1,990.10 × 918
4. Step 4: Simplify right side
   1,442.00x = 1,826,914.10
5. Step 5: Solve for x
   x = 1,826,914.10/1,442.00
6. Step 6: Final answer
   x = 1,266.93