Finding the Fourth Proportional to 42,791.30, 64,133.48 and 20,598.74

Step by Step Solution

1. Step 1: Write the proportion equation
   42,791.30 : 64,133.48 = 20,598.74 : x
2. Step 2: Convert to fraction form
   42,791.30/64,133.48 = 20,598.74/x
3. Step 3: Cross multiply
   42,791.30x = 64,133.48 × 20,598.74
4. Step 4: Simplify right side
   42,791.30x = 1,321,068,456.15
5. Step 5: Solve for x
   x = 1,321,068,456.15/42,791.30
6. Step 6: Final answer
   x = 30,872.36