Finding the Fourth Proportional to 37,986.42, 52,418.56 and 20,990.48

Step by Step Solution

1. Step 1: Write the proportion equation
   37,986.42 : 52,418.56 = 20,990.48 : x
2. Step 2: Convert to fraction form
   37,986.42/52,418.56 = 20,990.48/x
3. Step 3: Cross multiply
   37,986.42x = 52,418.56 × 20,990.48
4. Step 4: Simplify right side
   37,986.42x = 1,100,290,460.10
5. Step 5: Solve for x
   x = 1,100,290,460.10/37,986.42
6. Step 6: Final answer
   x = 28,965.36