Finding the Fourth Proportional to 2,491.89, 3,438.23 and 1,607.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.89 : 3,438.23 = 1,607.91 : x
2. Step 2: Convert to fraction form
   2,491.89/3,438.23 = 1,607.91/x
3. Step 3: Cross multiply
   2,491.89x = 3,438.23 × 1,607.91
4. Step 4: Simplify right side
   2,491.89x = 5,528,356.36
5. Step 5: Solve for x
   x = 5,528,356.36/2,491.89
6. Step 6: Final answer
   x = 2,218.54