Finding the Fourth Proportional to 3,457.82, 5,174.34 and 1,989.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,457.82 : 5,174.34 = 1,989.78 : x
2. Step 2: Convert to fraction form
   3,457.82/5,174.34 = 1,989.78/x
3. Step 3: Cross multiply
   3,457.82x = 5,174.34 × 1,989.78
4. Step 4: Simplify right side
   3,457.82x = 10,295,798.25
5. Step 5: Solve for x
   x = 10,295,798.25/3,457.82
6. Step 6: Final answer
   x = 2,977.54