Finding the Fourth Proportional to 8,123.87, 11,212.72 and 5,143.68

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.87 : 11,212.72 = 5,143.68 : x
2. Step 2: Convert to fraction form
   8,123.87/11,212.72 = 5,143.68/x
3. Step 3: Cross multiply
   8,123.87x = 11,212.72 × 5,143.68
4. Step 4: Simplify right side
   8,123.87x = 57,674,643.61
5. Step 5: Solve for x
   x = 57,674,643.61/8,123.87
6. Step 6: Final answer
   x = 7,099.41