Finding the Fourth Proportional to 390,105.77, 585,098.89 and 123,831.77

Step by Step Solution

1. Step 1: Write the proportion equation
   390,105.77 : 585,098.89 = 123,831.77 : x
2. Step 2: Convert to fraction form
   390,105.77/585,098.89 = 123,831.77/x
3. Step 3: Cross multiply
   390,105.77x = 585,098.89 × 123,831.77
4. Step 4: Simplify right side
   390,105.77x = 72,453,827,938.66
5. Step 5: Solve for x
   x = 72,453,827,938.66/390,105.77
6. Step 6: Final answer
   x = 185,728.68