Finding the Fourth Proportional to 388,831.89, 536,587.98 and 209,983.89

Step by Step Solution

1. Step 1: Write the proportion equation
   388,831.89 : 536,587.98 = 209,983.89 : x
2. Step 2: Convert to fraction form
   388,831.89/536,587.98 = 209,983.89/x
3. Step 3: Cross multiply
   388,831.89x = 536,587.98 × 209,983.89
4. Step 4: Simplify right side
   388,831.89x = 112,674,831,367.64
5. Step 5: Solve for x
   x = 112,674,831,367.64/388,831.89
6. Step 6: Final answer
   x = 289,777.75