Finding the Fourth Proportional to 12,142.88, 18,216.56 and 4,746.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142.88 : 18,216.56 = 4,746.87 : x
2. Step 2: Convert to fraction form
   12,142.88/18,216.56 = 4,746.87/x
3. Step 3: Cross multiply
   12,142.88x = 18,216.56 × 4,746.87
4. Step 4: Simplify right side
   12,142.88x = 86,471,654.03
5. Step 5: Solve for x
   x = 86,471,654.03/12,142.88
6. Step 6: Final answer
   x = 7,121.18