Finding the Fourth Proportional to 451,314.72, 676,976.40 and 214,680.96

Step by Step Solution

1. Step 1: Write the proportion equation
   451,314.72 : 676,976.40 = 214,680.96 : x
2. Step 2: Convert to fraction form
   451,314.72/676,976.40 = 214,680.96/x
3. Step 3: Cross multiply
   451,314.72x = 676,976.40 × 214,680.96
4. Step 4: Simplify right side
   451,314.72x = 145,333,943,449.34
5. Step 5: Solve for x
   x = 145,333,943,449.34/451,314.72
6. Step 6: Final answer
   x = 322,023.49