Finding the Fourth Proportional to 17,978.51, 26,771.92 and 17,781.99

Step by Step Solution

1. Step 1: Write the proportion equation
   17,978.51 : 26,771.92 = 17,781.99 : x
2. Step 2: Convert to fraction form
   17,978.51/26,771.92 = 17,781.99/x
3. Step 3: Cross multiply
   17,978.51x = 26,771.92 × 17,781.99
4. Step 4: Simplify right side
   17,978.51x = 476,058,013.72
5. Step 5: Solve for x
   x = 476,058,013.72/17,978.51
6. Step 6: Final answer
   x = 26,479.28