Finding the Fourth Proportional to 208,078.72, 287,149.98 and 122,020.19

Step by Step Solution

1. Step 1: Write the proportion equation
   208,078.72 : 287,149.98 = 122,020.19 : x
2. Step 2: Convert to fraction form
   208,078.72/287,149.98 = 122,020.19/x
3. Step 3: Cross multiply
   208,078.72x = 287,149.98 × 122,020.19
4. Step 4: Simplify right side
   208,078.72x = 35,038,094,508.00
5. Step 5: Solve for x
   x = 35,038,094,508.00/208,078.72
6. Step 6: Final answer
   x = 168,388.65