Finding the Fourth Proportional to 402,696.72, 604,511.72 and 216,072.72

Step by Step Solution

1. Step 1: Write the proportion equation
   402,696.72 : 604,511.72 = 216,072.72 : x
2. Step 2: Convert to fraction form
   402,696.72/604,511.72 = 216,072.72/x
3. Step 3: Cross multiply
   402,696.72x = 604,511.72 × 216,072.72
4. Step 4: Simplify right side
   402,696.72x = 130,618,491,612.28
5. Step 5: Solve for x
   x = 130,618,491,612.28/402,696.72
6. Step 6: Final answer
   x = 324,359.46