Finding the Fourth Proportional to 1,591.74, 2,388.69 and 617.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.74 : 2,388.69 = 617.72 : x
2. Step 2: Convert to fraction form
   1,591.74/2,388.69 = 617.72/x
3. Step 3: Cross multiply
   1,591.74x = 2,388.69 × 617.72
4. Step 4: Simplify right side
   1,591.74x = 1,475,529.64
5. Step 5: Solve for x
   x = 1,475,529.64/1,591.74
6. Step 6: Final answer
   x = 926.99