Finding the Fourth Proportional to 1,801.45, 2,485.50 and 1,139.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.45 : 2,485.50 = 1,139.14 : x
2. Step 2: Convert to fraction form
   1,801.45/2,485.50 = 1,139.14/x
3. Step 3: Cross multiply
   1,801.45x = 2,485.50 × 1,139.14
4. Step 4: Simplify right side
   1,801.45x = 2,831,320.04
5. Step 5: Solve for x
   x = 2,831,320.04/1,801.45
6. Step 6: Final answer
   x = 1,571.69