Finding the Fourth Proportional to 7,123.64, 10,676.15 and 5,155.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.64 : 10,676.15 = 5,155.89 : x
2. Step 2: Convert to fraction form
   7,123.64/10,676.15 = 5,155.89/x
3. Step 3: Cross multiply
   7,123.64x = 10,676.15 × 5,155.89
4. Step 4: Simplify right side
   7,123.64x = 55,045,029.24
5. Step 5: Solve for x
   x = 55,045,029.24/7,123.64
6. Step 6: Final answer
   x = 7,727.10