Finding the Fourth Proportional to 1,377.32, 2,075.46 and 1,139.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.32 : 2,075.46 = 1,139.20 : x
2. Step 2: Convert to fraction form
   1,377.32/2,075.46 = 1,139.20/x
3. Step 3: Cross multiply
   1,377.32x = 2,075.46 × 1,139.20
4. Step 4: Simplify right side
   1,377.32x = 2,364,364.03
5. Step 5: Solve for x
   x = 2,364,364.03/1,377.32
6. Step 6: Final answer
   x = 1,716.64