Finding the Fourth Proportional to 407,067.56, 609,810.78 and 229,031.72

Step by Step Solution

1. Step 1: Write the proportion equation
   407,067.56 : 609,810.78 = 229,031.72 : x
2. Step 2: Convert to fraction form
   407,067.56/609,810.78 = 229,031.72/x
3. Step 3: Cross multiply
   407,067.56x = 609,810.78 × 229,031.72
4. Step 4: Simplify right side
   407,067.56x = 139,666,011,817.94
5. Step 5: Solve for x
   x = 139,666,011,817.94/407,067.56
6. Step 6: Final answer
   x = 343,102.78