Finding the Fourth Proportional to 37,980.78, 52,412.55 and 20,986.38

Step by Step Solution

1. Step 1: Write the proportion equation
   37,980.78 : 52,412.55 = 20,986.38 : x
2. Step 2: Convert to fraction form
   37,980.78/52,412.55 = 20,986.38/x
3. Step 3: Cross multiply
   37,980.78x = 52,412.55 × 20,986.38
4. Step 4: Simplify right side
   37,980.78x = 1,099,949,691.07
5. Step 5: Solve for x
   x = 1,099,949,691.07/37,980.78
6. Step 6: Final answer
   x = 28,960.69