Finding the Fourth Proportional to 2,640.42, 3,642.64 and 1,591.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.42 : 3,642.64 = 1,591.88 : x
2. Step 2: Convert to fraction form
   2,640.42/3,642.64 = 1,591.88/x
3. Step 3: Cross multiply
   2,640.42x = 3,642.64 × 1,591.88
4. Step 4: Simplify right side
   2,640.42x = 5,798,623.57
5. Step 5: Solve for x
   x = 5,798,623.57/2,640.42
6. Step 6: Final answer
   x = 2,196.10