Finding the Fourth Proportional to 42,859.75, 64,299.89 and 17,885.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,859.75 : 64,299.89 = 17,885.91 : x
2. Step 2: Convert to fraction form
   42,859.75/64,299.89 = 17,885.91/x
3. Step 3: Cross multiply
   42,859.75x = 64,299.89 × 17,885.91
4. Step 4: Simplify right side
   42,859.75x = 1,150,062,045.55
5. Step 5: Solve for x
   x = 1,150,062,045.55/42,859.75
6. Step 6: Final answer
   x = 26,833.15