Finding the Fourth Proportional to 1,662.70, 2,488.77 and 930.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.70 : 2,488.77 = 930.05 : x
2. Step 2: Convert to fraction form
   1,662.70/2,488.77 = 930.05/x
3. Step 3: Cross multiply
   1,662.70x = 2,488.77 × 930.05
4. Step 4: Simplify right side
   1,662.70x = 2,314,680.54
5. Step 5: Solve for x
   x = 2,314,680.54/1,662.70
6. Step 6: Final answer
   x = 1,392.12