Finding the Fourth Proportional to 426,684.16, 640,062.72 and 111,141.12

Step by Step Solution

1. Step 1: Write the proportion equation
   426,684.16 : 640,062.72 = 111,141.12 : x
2. Step 2: Convert to fraction form
   426,684.16/640,062.72 = 111,141.12/x
3. Step 3: Cross multiply
   426,684.16x = 640,062.72 × 111,141.12
4. Step 4: Simplify right side
   426,684.16x = 71,137,287,571.05
5. Step 5: Solve for x
   x = 71,137,287,571.05/426,684.16
6. Step 6: Final answer
   x = 166,721.18