Finding the Fourth Proportional to 5,123.96, 7,070.50 and 2,885.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.96 : 7,070.50 = 2,885.78 : x
2. Step 2: Convert to fraction form
   5,123.96/7,070.50 = 2,885.78/x
3. Step 3: Cross multiply
   5,123.96x = 7,070.50 × 2,885.78
4. Step 4: Simplify right side
   5,123.96x = 20,403,907.49
5. Step 5: Solve for x
   x = 20,403,907.49/5,123.96
6. Step 6: Final answer
   x = 3,982.06