Finding the Fourth Proportional to 5,780.88, 7,977.63 and 3,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,780.88 : 7,977.63 = 3,128.31 : x
2. Step 2: Convert to fraction form
   5,780.88/7,977.63 = 3,128.31/x
3. Step 3: Cross multiply
   5,780.88x = 7,977.63 × 3,128.31
4. Step 4: Simplify right side
   5,780.88x = 24,956,499.71
5. Step 5: Solve for x
   x = 24,956,499.71/5,780.88
6. Step 6: Final answer
   x = 4,317.08