Finding the Fourth Proportional to 276,667.30, 415,049.55 and 99,277.30

Step by Step Solution

1. Step 1: Write the proportion equation
   276,667.30 : 415,049.55 = 99,277.30 : x
2. Step 2: Convert to fraction form
   276,667.30/415,049.55 = 99,277.30/x
3. Step 3: Cross multiply
   276,667.30x = 415,049.55 × 99,277.30
4. Step 4: Simplify right side
   276,667.30x = 41,204,998,690.22
5. Step 5: Solve for x
   x = 41,204,998,690.22/276,667.30
6. Step 6: Final answer
   x = 148,933.39