Finding the Fourth Proportional to 1,399.75, 1,931.70 and 875.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.75 : 1,931.70 = 875.50 : x
2. Step 2: Convert to fraction form
   1,399.75/1,931.70 = 875.50/x
3. Step 3: Cross multiply
   1,399.75x = 1,931.70 × 875.50
4. Step 4: Simplify right side
   1,399.75x = 1,691,203.35
5. Step 5: Solve for x
   x = 1,691,203.35/1,399.75
6. Step 6: Final answer
   x = 1,208.22