Finding the Fourth Proportional to 410,665.49, 616,384.67 and 208,406.82

Step by Step Solution

1. Step 1: Write the proportion equation
   410,665.49 : 616,384.67 = 208,406.82 : x
2. Step 2: Convert to fraction form
   410,665.49/616,384.67 = 208,406.82/x
3. Step 3: Cross multiply
   410,665.49x = 616,384.67 × 208,406.82
4. Step 4: Simplify right side
   410,665.49x = 128,458,767,929.42
5. Step 5: Solve for x
   x = 128,458,767,929.42/410,665.49
6. Step 6: Final answer
   x = 312,806.34