Finding the Fourth Proportional to 42,837.47, 64,315.18 and 21,791.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,837.47 : 64,315.18 = 21,791.76 : x
2. Step 2: Convert to fraction form
   42,837.47/64,315.18 = 21,791.76/x
3. Step 3: Cross multiply
   42,837.47x = 64,315.18 × 21,791.76
4. Step 4: Simplify right side
   42,837.47x = 1,401,540,912.44
5. Step 5: Solve for x
   x = 1,401,540,912.44/42,837.47
6. Step 6: Final answer
   x = 32,717.64