Finding the Fourth Proportional to 406,713.72, 609,920.82 and 140,405.88

Step by Step Solution

1. Step 1: Write the proportion equation
   406,713.72 : 609,920.82 = 140,405.88 : x
2. Step 2: Convert to fraction form
   406,713.72/609,920.82 = 140,405.88/x
3. Step 3: Cross multiply
   406,713.72x = 609,920.82 × 140,405.88
4. Step 4: Simplify right side
   406,713.72x = 85,636,469,462.42
5. Step 5: Solve for x
   x = 85,636,469,462.42/406,713.72
6. Step 6: Final answer
   x = 210,557.12