Finding the Fourth Proportional to 390,112.72, 585,109.16 and 123,838.64

Step by Step Solution

1. Step 1: Write the proportion equation
   390,112.72 : 585,109.16 = 123,838.64 : x
2. Step 2: Convert to fraction form
   390,112.72/585,109.16 = 123,838.64/x
3. Step 3: Cross multiply
   390,112.72x = 585,109.16 × 123,838.64
4. Step 4: Simplify right side
   390,112.72x = 72,459,122,625.94
5. Step 5: Solve for x
   x = 72,459,122,625.94/390,112.72
6. Step 6: Final answer
   x = 185,738.94