Finding the Fourth Proportional to 5,457.72, 7,531.71 and 3,099.91

Step by Step Solution

1. Step 1: Write the proportion equation
   5,457.72 : 7,531.71 = 3,099.91 : x
2. Step 2: Convert to fraction form
   5,457.72/7,531.71 = 3,099.91/x
3. Step 3: Cross multiply
   5,457.72x = 7,531.71 × 3,099.91
4. Step 4: Simplify right side
   5,457.72x = 23,347,623.15
5. Step 5: Solve for x
   x = 23,347,623.15/5,457.72
6. Step 6: Final answer
   x = 4,277.91