Finding the Fourth Proportional to 1,405.10, 2,105.94 and 994.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.10 : 2,105.94 = 994.35 : x
2. Step 2: Convert to fraction form
   1,405.10/2,105.94 = 994.35/x
3. Step 3: Cross multiply
   1,405.10x = 2,105.94 × 994.35
4. Step 4: Simplify right side
   1,405.10x = 2,094,041.44
5. Step 5: Solve for x
   x = 2,094,041.44/1,405.10
6. Step 6: Final answer
   x = 1,490.31