Finding the Fourth Proportional to 1,388.17, 1,915.41 and 967.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.17 : 1,915.41 = 967.87 : x
2. Step 2: Convert to fraction form
   1,388.17/1,915.41 = 967.87/x
3. Step 3: Cross multiply
   1,388.17x = 1,915.41 × 967.87
4. Step 4: Simplify right side
   1,388.17x = 1,853,867.88
5. Step 5: Solve for x
   x = 1,853,867.88/1,388.17
6. Step 6: Final answer
   x = 1,335.48