Finding the Fourth Proportional to 300,278.88, 414,322.56 and 172,920.96

Step by Step Solution

1. Step 1: Write the proportion equation
   300,278.88 : 414,322.56 = 172,920.96 : x
2. Step 2: Convert to fraction form
   300,278.88/414,322.56 = 172,920.96/x
3. Step 3: Cross multiply
   300,278.88x = 414,322.56 × 172,920.96
4. Step 4: Simplify right side
   300,278.88x = 71,645,054,824.86
5. Step 5: Solve for x
   x = 71,645,054,824.86/300,278.88
6. Step 6: Final answer
   x = 238,595.05