Finding the Fourth Proportional to 42,726.30, 64,095.53 and 13,146.54

Step by Step Solution

1. Step 1: Write the proportion equation
   42,726.30 : 64,095.53 = 13,146.54 : x
2. Step 2: Convert to fraction form
   42,726.30/64,095.53 = 13,146.54/x
3. Step 3: Cross multiply
   42,726.30x = 64,095.53 × 13,146.54
4. Step 4: Simplify right side
   42,726.30x = 842,634,383.23
5. Step 5: Solve for x
   x = 842,634,383.23/42,726.30
6. Step 6: Final answer
   x = 19,721.68