Finding the Fourth Proportional to 1,393.41, 2,086.47 and 980.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.41 : 2,086.47 = 980.31 : x
2. Step 2: Convert to fraction form
   1,393.41/2,086.47 = 980.31/x
3. Step 3: Cross multiply
   1,393.41x = 2,086.47 × 980.31
4. Step 4: Simplify right side
   1,393.41x = 2,045,387.41
5. Step 5: Solve for x
   x = 2,045,387.41/1,393.41
6. Step 6: Final answer
   x = 1,467.90