Finding the Fourth Proportional to 17,946.90, 26,978.67 and 17,859.42

Step by Step Solution

1. Step 1: Write the proportion equation
   17,946.90 : 26,978.67 = 17,859.42 : x
2. Step 2: Convert to fraction form
   17,946.90/26,978.67 = 17,859.42/x
3. Step 3: Cross multiply
   17,946.90x = 26,978.67 × 17,859.42
4. Step 4: Simplify right side
   17,946.90x = 481,823,398.57
5. Step 5: Solve for x
   x = 481,823,398.57/17,946.90
6. Step 6: Final answer
   x = 26,847.17