Finding the Fourth Proportional to 429,680.72, 644,521.32 and 163,379.72

Step by Step Solution

1. Step 1: Write the proportion equation
   429,680.72 : 644,521.32 = 163,379.72 : x
2. Step 2: Convert to fraction form
   429,680.72/644,521.32 = 163,379.72/x
3. Step 3: Cross multiply
   429,680.72x = 644,521.32 × 163,379.72
4. Step 4: Simplify right side
   429,680.72x = 105,301,712,795.63
5. Step 5: Solve for x
   x = 105,301,712,795.63/429,680.72
6. Step 6: Final answer
   x = 245,069.67