Finding the Fourth Proportional to 42,733.58, 64,076.88 and 13,143.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,733.58 : 64,076.88 = 13,143.20 : x
2. Step 2: Convert to fraction form
   42,733.58/64,076.88 = 13,143.20/x
3. Step 3: Cross multiply
   42,733.58x = 64,076.88 × 13,143.20
4. Step 4: Simplify right side
   42,733.58x = 842,175,249.22
5. Step 5: Solve for x
   x = 842,175,249.22/42,733.58
6. Step 6: Final answer
   x = 19,707.58