Finding the Fourth Proportional to 5,776.50, 7,971.58 and 3,123.91

Step by Step Solution

1. Step 1: Write the proportion equation
   5,776.50 : 7,971.58 = 3,123.91 : x
2. Step 2: Convert to fraction form
   5,776.50/7,971.58 = 3,123.91/x
3. Step 3: Cross multiply
   5,776.50x = 7,971.58 × 3,123.91
4. Step 4: Simplify right side
   5,776.50x = 24,902,498.48
5. Step 5: Solve for x
   x = 24,902,498.48/5,776.50
6. Step 6: Final answer
   x = 4,311.00