Finding the Fourth Proportional to 276,665.30, 415,046.55 and 99,275.30

Step by Step Solution

1. Step 1: Write the proportion equation
   276,665.30 : 415,046.55 = 99,275.30 : x
2. Step 2: Convert to fraction form
   276,665.30/415,046.55 = 99,275.30/x
3. Step 3: Cross multiply
   276,665.30x = 415,046.55 × 99,275.30
4. Step 4: Simplify right side
   276,665.30x = 41,203,870,765.22
5. Step 5: Solve for x
   x = 41,203,870,765.22/276,665.30
6. Step 6: Final answer
   x = 148,930.39