Finding the Fourth Proportional to 3,457.16, 5,184.22 and 991.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,457.16 : 5,184.22 = 991.42 : x
2. Step 2: Convert to fraction form
   3,457.16/5,184.22 = 991.42/x
3. Step 3: Cross multiply
   3,457.16x = 5,184.22 × 991.42
4. Step 4: Simplify right side
   3,457.16x = 5,139,734.44
5. Step 5: Solve for x
   x = 5,139,734.44/3,457.16
6. Step 6: Final answer
   x = 1,486.69