Finding the Fourth Proportional to 78,074.14, 117,087 and 28,147.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,074.14 : 117,087 = 28,147.78 : x
2. Step 2: Convert to fraction form
   78,074.14/117,087 = 28,147.78/x
3. Step 3: Cross multiply
   78,074.14x = 117,087 × 28,147.78
4. Step 4: Simplify right side
   78,074.14x = 3,295,739,116.86
5. Step 5: Solve for x
   x = 3,295,739,116.86/78,074.14
6. Step 6: Final answer
   x = 42,212.94