Finding the Fourth Proportional to 1,397.42, 1,931.13 and 1,131.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.42 : 1,931.13 = 1,131.33 : x
2. Step 2: Convert to fraction form
   1,397.42/1,931.13 = 1,131.33/x
3. Step 3: Cross multiply
   1,397.42x = 1,931.13 × 1,131.33
4. Step 4: Simplify right side
   1,397.42x = 2,184,745.30
5. Step 5: Solve for x
   x = 2,184,745.30/1,397.42
6. Step 6: Final answer
   x = 1,563.42