Finding the Fourth Proportional to 390,771.52, 585,238.72 and 190,464.18

Step by Step Solution

1. Step 1: Write the proportion equation
   390,771.52 : 585,238.72 = 190,464.18 : x
2. Step 2: Convert to fraction form
   390,771.52/585,238.72 = 190,464.18/x
3. Step 3: Cross multiply
   390,771.52x = 585,238.72 × 190,464.18
4. Step 4: Simplify right side
   390,771.52x = 111,467,012,909.05
5. Step 5: Solve for x
   x = 111,467,012,909.05/390,771.52
6. Step 6: Final answer
   x = 285,248.56