Finding the Fourth Proportional to 12,142.79, 18,218.78 and 4,752.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142.79 : 18,218.78 = 4,752.53 : x
2. Step 2: Convert to fraction form
   12,142.79/18,218.78 = 4,752.53/x
3. Step 3: Cross multiply
   12,142.79x = 18,218.78 × 4,752.53
4. Step 4: Simplify right side
   12,142.79x = 86,585,274.75
5. Step 5: Solve for x
   x = 86,585,274.75/12,142.79
6. Step 6: Final answer
   x = 7,130.59