Finding the Fourth Proportional to 1,805.57, 2,491.69 and 977.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.57 : 2,491.69 = 977.57 : x
2. Step 2: Convert to fraction form
   1,805.57/2,491.69 = 977.57/x
3. Step 3: Cross multiply
   1,805.57x = 2,491.69 × 977.57
4. Step 4: Simplify right side
   1,805.57x = 2,435,801.39
5. Step 5: Solve for x
   x = 2,435,801.39/1,805.57
6. Step 6: Final answer
   x = 1,349.05