Finding the Fourth Proportional to 2,085.57, 3,130.23 and 917.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.57 : 3,130.23 = 917.37 : x
2. Step 2: Convert to fraction form
   2,085.57/3,130.23 = 917.37/x
3. Step 3: Cross multiply
   2,085.57x = 3,130.23 × 917.37
4. Step 4: Simplify right side
   2,085.57x = 2,871,579.10
5. Step 5: Solve for x
   x = 2,871,579.10/2,085.57
6. Step 6: Final answer
   x = 1,376.88