Finding the Fourth Proportional to 5,123.72, 7,070.14 and 2,885.54

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.72 : 7,070.14 = 2,885.54 : x
2. Step 2: Convert to fraction form
   5,123.72/7,070.14 = 2,885.54/x
3. Step 3: Cross multiply
   5,123.72x = 7,070.14 × 2,885.54
4. Step 4: Simplify right side
   5,123.72x = 20,401,171.78
5. Step 5: Solve for x
   x = 20,401,171.78/5,123.72
6. Step 6: Final answer
   x = 3,981.71