Finding the Fourth Proportional to 5,142.70, 7,714.59 and 1,679.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,142.70 : 7,714.59 = 1,679.50 : x
2. Step 2: Convert to fraction form
   5,142.70/7,714.59 = 1,679.50/x
3. Step 3: Cross multiply
   5,142.70x = 7,714.59 × 1,679.50
4. Step 4: Simplify right side
   5,142.70x = 12,956,653.91
5. Step 5: Solve for x
   x = 12,956,653.91/5,142.70
6. Step 6: Final answer
   x = 2,519.43