Finding the Fourth Proportional to 7,429.10, 11,142.69 and 2,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,429.10 : 11,142.69 = 2,811.50 : x
2. Step 2: Convert to fraction form
   7,429.10/11,142.69 = 2,811.50/x
3. Step 3: Cross multiply
   7,429.10x = 11,142.69 × 2,811.50
4. Step 4: Simplify right side
   7,429.10x = 31,327,672.94
5. Step 5: Solve for x
   x = 31,327,672.94/7,429.10
6. Step 6: Final answer
   x = 4,216.89