Finding the Fourth Proportional to 12,729.72, 18,963.33 and 12,342.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,729.72 : 18,963.33 = 12,342.81 : x
2. Step 2: Convert to fraction form
   12,729.72/18,963.33 = 12,342.81/x
3. Step 3: Cross multiply
   12,729.72x = 18,963.33 × 12,342.81
4. Step 4: Simplify right side
   12,729.72x = 234,060,779.16
5. Step 5: Solve for x
   x = 234,060,779.16/12,729.72
6. Step 6: Final answer
   x = 18,386.95