Finding the Fourth Proportional to 3,457.30, 5,184.38 and 991.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,457.30 : 5,184.38 = 991.56 : x
2. Step 2: Convert to fraction form
   3,457.30/5,184.38 = 991.56/x
3. Step 3: Cross multiply
   3,457.30x = 5,184.38 × 991.56
4. Step 4: Simplify right side
   3,457.30x = 5,140,623.83
5. Step 5: Solve for x
   x = 5,140,623.83/3,457.30
6. Step 6: Final answer
   x = 1,486.89