Finding the Fourth Proportional to 42,729.54, 64,083.51 and 12,736.86

Step by Step Solution

1. Step 1: Write the proportion equation
   42,729.54 : 64,083.51 = 12,736.86 : x
2. Step 2: Convert to fraction form
   42,729.54/64,083.51 = 12,736.86/x
3. Step 3: Cross multiply
   42,729.54x = 64,083.51 × 12,736.86
4. Step 4: Simplify right side
   42,729.54x = 816,222,695.18
5. Step 5: Solve for x
   x = 816,222,695.18/42,729.54
6. Step 6: Final answer
   x = 19,102.07