Finding the Fourth Proportional to 47,428.74, 65,452.05 and 28,578.42

Step by Step Solution

1. Step 1: Write the proportion equation
   47,428.74 : 65,452.05 = 28,578.42 : x
2. Step 2: Convert to fraction form
   47,428.74/65,452.05 = 28,578.42/x
3. Step 3: Cross multiply
   47,428.74x = 65,452.05 × 28,578.42
4. Step 4: Simplify right side
   47,428.74x = 1,870,516,174.76
5. Step 5: Solve for x
   x = 1,870,516,174.76/47,428.74
6. Step 6: Final answer
   x = 39,438.45