Finding the Fourth Proportional to 390,789.86, 585,878.56 and 154,309.55

Step by Step Solution

1. Step 1: Write the proportion equation
   390,789.86 : 585,878.56 = 154,309.55 : x
2. Step 2: Convert to fraction form
   390,789.86/585,878.56 = 154,309.55/x
3. Step 3: Cross multiply
   390,789.86x = 585,878.56 × 154,309.55
4. Step 4: Simplify right side
   390,789.86x = 90,406,656,948.25
5. Step 5: Solve for x
   x = 90,406,656,948.25/390,789.86
6. Step 6: Final answer
   x = 231,343.41