Finding the Fourth Proportional to 430,478.82, 645,734.52 and 219,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   430,478.82 : 645,734.52 = 219,870.72 : x
2. Step 2: Convert to fraction form
   430,478.82/645,734.52 = 219,870.72/x
3. Step 3: Cross multiply
   430,478.82x = 645,734.52 × 219,870.72
4. Step 4: Simplify right side
   430,478.82x = 141,978,113,841.25
5. Step 5: Solve for x
   x = 141,978,113,841.25/430,478.82
6. Step 6: Final answer
   x = 329,814.40