Finding the Fourth Proportional to 388,499.05, 582,831.96 and 220,100.05

Step by Step Solution

1. Step 1: Write the proportion equation
   388,499.05 : 582,831.96 = 220,100.05 : x
2. Step 2: Convert to fraction form
   388,499.05/582,831.96 = 220,100.05/x
3. Step 3: Cross multiply
   388,499.05x = 582,831.96 × 220,100.05
4. Step 4: Simplify right side
   388,499.05x = 128,281,343,440.76
5. Step 5: Solve for x
   x = 128,281,343,440.76/388,499.05
6. Step 6: Final answer
   x = 330,197.31