Finding the Fourth Proportional to 57,978.91, 86,980.77 and 17,997.01

Step by Step Solution

1. Step 1: Write the proportion equation
   57,978.91 : 86,980.77 = 17,997.01 : x
2. Step 2: Convert to fraction form
   57,978.91/86,980.77 = 17,997.01/x
3. Step 3: Cross multiply
   57,978.91x = 86,980.77 × 17,997.01
4. Step 4: Simplify right side
   57,978.91x = 1,565,394,126.80
5. Step 5: Solve for x
   x = 1,565,394,126.80/57,978.91
6. Step 6: Final answer
   x = 26,999.37