Finding the Fourth Proportional to 7,581.36, 10,457.52 and 5,219.40

Step by Step Solution

1. Step 1: Write the proportion equation
   7,581.36 : 10,457.52 = 5,219.40 : x
2. Step 2: Convert to fraction form
   7,581.36/10,457.52 = 5,219.40/x
3. Step 3: Cross multiply
   7,581.36x = 10,457.52 × 5,219.40
4. Step 4: Simplify right side
   7,581.36x = 54,581,979.89
5. Step 5: Solve for x
   x = 54,581,979.89/7,581.36
6. Step 6: Final answer
   x = 7,199.50