Finding the Fourth Proportional to 390,788.86, 585,877.06 and 154,308.55

Step by Step Solution

1. Step 1: Write the proportion equation
   390,788.86 : 585,877.06 = 154,308.55 : x
2. Step 2: Convert to fraction form
   390,788.86/585,877.06 = 154,308.55/x
3. Step 3: Cross multiply
   390,788.86x = 585,877.06 × 154,308.55
4. Step 4: Simplify right side
   390,788.86x = 90,405,839,606.86
5. Step 5: Solve for x
   x = 90,405,839,606.86/390,788.86
6. Step 6: Final answer
   x = 231,341.91