Finding the Fourth Proportional to 5,142.72, 7,698.72 and 3,914.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,142.72 : 7,698.72 = 3,914.88 : x
2. Step 2: Convert to fraction form
   5,142.72/7,698.72 = 3,914.88/x
3. Step 3: Cross multiply
   5,142.72x = 7,698.72 × 3,914.88
4. Step 4: Simplify right side
   5,142.72x = 30,139,564.95
5. Step 5: Solve for x
   x = 30,139,564.95/5,142.72
6. Step 6: Final answer
   x = 5,860.63