Finding the Fourth Proportional to 1,671.72, 2,505.42 and 940.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,671.72 : 2,505.42 = 940.20 : x
2. Step 2: Convert to fraction form
   1,671.72/2,505.42 = 940.20/x
3. Step 3: Cross multiply
   1,671.72x = 2,505.42 × 940.20
4. Step 4: Simplify right side
   1,671.72x = 2,355,595.88
5. Step 5: Solve for x
   x = 2,355,595.88/1,671.72
6. Step 6: Final answer
   x = 1,409.09