Finding the Fourth Proportional to 1,338.21, 2,005.05 and 875.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.21 : 2,005.05 = 875.31 : x
2. Step 2: Convert to fraction form
   1,338.21/2,005.05 = 875.31/x
3. Step 3: Cross multiply
   1,338.21x = 2,005.05 × 875.31
4. Step 4: Simplify right side
   1,338.21x = 1,755,040.32
5. Step 5: Solve for x
   x = 1,755,040.32/1,338.21
6. Step 6: Final answer
   x = 1,311.48