Finding the Fourth Proportional to 399,046.89, 550,696.41 and 217,770.52

Step by Step Solution

1. Step 1: Write the proportion equation
   399,046.89 : 550,696.41 = 217,770.52 : x
2. Step 2: Convert to fraction form
   399,046.89/550,696.41 = 217,770.52/x
3. Step 3: Cross multiply
   399,046.89x = 550,696.41 × 217,770.52
4. Step 4: Simplify right side
   399,046.89x = 119,925,443,567.83
5. Step 5: Solve for x
   x = 119,925,443,567.83/399,046.89
6. Step 6: Final answer
   x = 300,529.70