Finding the Fourth Proportional to 390,085.12, 585,149.55 and 109,580.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,085.12 : 585,149.55 = 109,580.50 : x
2. Step 2: Convert to fraction form
   390,085.12/585,149.55 = 109,580.50/x
3. Step 3: Cross multiply
   390,085.12x = 585,149.55 × 109,580.50
4. Step 4: Simplify right side
   390,085.12x = 64,120,980,263.78
5. Step 5: Solve for x
   x = 64,120,980,263.78/390,085.12
6. Step 6: Final answer
   x = 164,376.89