Finding the Fourth Proportional to 388,561.15, 536,241.83 and 216,490.42

Step by Step Solution

1. Step 1: Write the proportion equation
   388,561.15 : 536,241.83 = 216,490.42 : x
2. Step 2: Convert to fraction form
   388,561.15/536,241.83 = 216,490.42/x
3. Step 3: Cross multiply
   388,561.15x = 536,241.83 × 216,490.42
4. Step 4: Simplify right side
   388,561.15x = 116,091,215,234.61
5. Step 5: Solve for x
   x = 116,091,215,234.61/388,561.15
6. Step 6: Final answer
   x = 298,772.06