Finding the Fourth Proportional to 1,311.39, 1,976.15 and 1,248.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.39 : 1,976.15 = 1,248.82 : x
2. Step 2: Convert to fraction form
   1,311.39/1,976.15 = 1,248.82/x
3. Step 3: Cross multiply
   1,311.39x = 1,976.15 × 1,248.82
4. Step 4: Simplify right side
   1,311.39x = 2,467,853.82
5. Step 5: Solve for x
   x = 2,467,853.82/1,311.39
6. Step 6: Final answer
   x = 1,881.86