Finding the Fourth Proportional to 1,805.31, 2,491.33 and 977.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.31 : 2,491.33 = 977.31 : x
2. Step 2: Convert to fraction form
   1,805.31/2,491.33 = 977.31/x
3. Step 3: Cross multiply
   1,805.31x = 2,491.33 × 977.31
4. Step 4: Simplify right side
   1,805.31x = 2,434,801.72
5. Step 5: Solve for x
   x = 2,434,801.72/1,805.31
6. Step 6: Final answer
   x = 1,348.69