Finding the Fourth Proportional to 42,859.42, 64,299.39 and 17,885.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,859.42 : 64,299.39 = 17,885.57 : x
2. Step 2: Convert to fraction form
   42,859.42/64,299.39 = 17,885.57/x
3. Step 3: Cross multiply
   42,859.42x = 64,299.39 × 17,885.57
4. Step 4: Simplify right side
   42,859.42x = 1,150,031,151.37
5. Step 5: Solve for x
   x = 1,150,031,151.37/42,859.42
6. Step 6: Final answer
   x = 26,832.64