Finding the Fourth Proportional to 1,291.35, 1,931.55 and 875.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.35 : 1,931.55 = 875.82 : x
2. Step 2: Convert to fraction form
   1,291.35/1,931.55 = 875.82/x
3. Step 3: Cross multiply
   1,291.35x = 1,931.55 × 875.82
4. Step 4: Simplify right side
   1,291.35x = 1,691,693.41
5. Step 5: Solve for x
   x = 1,691,693.41/1,291.35
6. Step 6: Final answer
   x = 1,310.02