Finding the Fourth Proportional to 1,591.88, 2,388.42 and 618.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.88 : 2,388.42 = 618.05 : x
2. Step 2: Convert to fraction form
   1,591.88/2,388.42 = 618.05/x
3. Step 3: Cross multiply
   1,591.88x = 2,388.42 × 618.05
4. Step 4: Simplify right side
   1,591.88x = 1,476,168.95
5. Step 5: Solve for x
   x = 1,476,168.95/1,591.88
6. Step 6: Final answer
   x = 927.31