Finding the Fourth Proportional to 390,123.86, 585,258.78 and 123,951.38

Step by Step Solution

1. Step 1: Write the proportion equation
   390,123.86 : 585,258.78 = 123,951.38 : x
2. Step 2: Convert to fraction form
   390,123.86/585,258.78 = 123,951.38/x
3. Step 3: Cross multiply
   390,123.86x = 585,258.78 × 123,951.38
4. Step 4: Simplify right side
   390,123.86x = 72,543,633,438.12
5. Step 5: Solve for x
   x = 72,543,633,438.12/390,123.86
6. Step 6: Final answer
   x = 185,950.26