Finding the Fourth Proportional to 49,711.42, 74,566.78 and 20,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   49,711.42 : 74,566.78 = 20,128.80 : x
2. Step 2: Convert to fraction form
   49,711.42/74,566.78 = 20,128.80/x
3. Step 3: Cross multiply
   49,711.42x = 74,566.78 × 20,128.80
4. Step 4: Simplify right side
   49,711.42x = 1,500,940,030.57
5. Step 5: Solve for x
   x = 1,500,940,030.57/49,711.42
6. Step 6: Final answer
   x = 30,193.06