Finding the Fourth Proportional to 1,664.42, 2,499.53 and 1,591.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,664.42 : 2,499.53 = 1,591.52 : x
2. Step 2: Convert to fraction form
   1,664.42/2,499.53 = 1,591.52/x
3. Step 3: Cross multiply
   1,664.42x = 2,499.53 × 1,591.52
4. Step 4: Simplify right side
   1,664.42x = 3,978,031.53
5. Step 5: Solve for x
   x = 3,978,031.53/1,664.42
6. Step 6: Final answer
   x = 2,390.05