Finding the Fourth Proportional to 1,380.38, 1,902.70 and 1,131.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.38 : 1,902.70 = 1,131.26 : x
2. Step 2: Convert to fraction form
   1,380.38/1,902.70 = 1,131.26/x
3. Step 3: Cross multiply
   1,380.38x = 1,902.70 × 1,131.26
4. Step 4: Simplify right side
   1,380.38x = 2,152,448.40
5. Step 5: Solve for x
   x = 2,152,448.40/1,380.38
6. Step 6: Final answer
   x = 1,559.32