Finding the Fourth Proportional to 7,142.80, 10,014.50 and 7,142.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,142.80 : 10,014.50 = 7,142.80 : x
2. Step 2: Convert to fraction form
   7,142.80/10,014.50 = 7,142.80/x
3. Step 3: Cross multiply
   7,142.80x = 10,014.50 × 7,142.80
4. Step 4: Simplify right side
   7,142.80x = 71,531,570.60
5. Step 5: Solve for x
   x = 71,531,570.60/7,142.80
6. Step 6: Final answer
   x = 10,014.50