Finding the Fourth Proportional to 87,404.25, 120,618 and 49,678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,404.25 : 120,618 = 49,678.50 : x
2. Step 2: Convert to fraction form
   87,404.25/120,618 = 49,678.50/x
3. Step 3: Cross multiply
   87,404.25x = 120,618 × 49,678.50
4. Step 4: Simplify right side
   87,404.25x = 5,992,121,313
5. Step 5: Solve for x
   x = 5,992,121,313/87,404.25
6. Step 6: Final answer
   x = 68,556.41