Finding the Fourth Proportional to 608,672.72, 839,967.72 and 340,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   608,672.72 : 839,967.72 = 340,400.72 : x
2. Step 2: Convert to fraction form
   608,672.72/839,967.72 = 340,400.72/x
3. Step 3: Cross multiply
   608,672.72x = 839,967.72 × 340,400.72
4. Step 4: Simplify right side
   608,672.72x = 285,925,616,664.76
5. Step 5: Solve for x
   x = 285,925,616,664.76/608,672.72
6. Step 6: Final answer
   x = 469,752.64