Finding the Fourth Proportional to 17,978.96, 26,971.80 and 6,131.60

Step by Step Solution

1. Step 1: Write the proportion equation
   17,978.96 : 26,971.80 = 6,131.60 : x
2. Step 2: Convert to fraction form
   17,978.96/26,971.80 = 6,131.60/x
3. Step 3: Cross multiply
   17,978.96x = 26,971.80 × 6,131.60
4. Step 4: Simplify right side
   17,978.96x = 165,380,288.88
5. Step 5: Solve for x
   x = 165,380,288.88/17,978.96
6. Step 6: Final answer
   x = 9,198.55