Finding the Fourth Proportional to 279,225.89, 415,680.72 and 277,565.15

Step by Step Solution

1. Step 1: Write the proportion equation
   279,225.89 : 415,680.72 = 277,565.15 : x
2. Step 2: Convert to fraction form
   279,225.89/415,680.72 = 277,565.15/x
3. Step 3: Cross multiply
   279,225.89x = 415,680.72 × 277,565.15
4. Step 4: Simplify right side
   279,225.89x = 115,378,479,320.50
5. Step 5: Solve for x
   x = 115,378,479,320.50/279,225.89
6. Step 6: Final answer
   x = 413,208.39