Finding the Fourth Proportional to 1,801.32, 2,485.32 and 1,139.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.32 : 2,485.32 = 1,139.01 : x
2. Step 2: Convert to fraction form
   1,801.32/2,485.32 = 1,139.01/x
3. Step 3: Cross multiply
   1,801.32x = 2,485.32 × 1,139.01
4. Step 4: Simplify right side
   1,801.32x = 2,830,804.33
5. Step 5: Solve for x
   x = 2,830,804.33/1,801.32
6. Step 6: Final answer
   x = 1,571.52