Finding the Fourth Proportional to 5,776.31, 7,971.31 and 3,123.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,776.31 : 7,971.31 = 3,123.72 : x
2. Step 2: Convert to fraction form
   5,776.31/7,971.31 = 3,123.72/x
3. Step 3: Cross multiply
   5,776.31x = 7,971.31 × 3,123.72
4. Step 4: Simplify right side
   5,776.31x = 24,900,140.47
5. Step 5: Solve for x
   x = 24,900,140.47/5,776.31
6. Step 6: Final answer
   x = 4,310.73