Finding the Fourth Proportional to 57,978.80, 86,919.60 and 30,276.80

Step by Step Solution

1. Step 1: Write the proportion equation
   57,978.80 : 86,919.60 = 30,276.80 : x
2. Step 2: Convert to fraction form
   57,978.80/86,919.60 = 30,276.80/x
3. Step 3: Cross multiply
   57,978.80x = 86,919.60 × 30,276.80
4. Step 4: Simplify right side
   57,978.80x = 2,631,647,345.28
5. Step 5: Solve for x
   x = 2,631,647,345.28/57,978.80
6. Step 6: Final answer
   x = 45,389.82