Finding the Fourth Proportional to 5,123.91, 7,069.78 and 2,885.34

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.91 : 7,069.78 = 2,885.34 : x
2. Step 2: Convert to fraction form
   5,123.91/7,069.78 = 2,885.34/x
3. Step 3: Cross multiply
   5,123.91x = 7,069.78 × 2,885.34
4. Step 4: Simplify right side
   5,123.91x = 20,398,679.89
5. Step 5: Solve for x
   x = 20,398,679.89/5,123.91
6. Step 6: Final answer
   x = 3,981.08