Finding the Fourth Proportional to 1,269.83, 1,739.69 and 1,220.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,269.83 : 1,739.69 = 1,220.62 : x
2. Step 2: Convert to fraction form
   1,269.83/1,739.69 = 1,220.62/x
3. Step 3: Cross multiply
   1,269.83x = 1,739.69 × 1,220.62
4. Step 4: Simplify right side
   1,269.83x = 2,123,499.51
5. Step 5: Solve for x
   x = 2,123,499.51/1,269.83
6. Step 6: Final answer
   x = 1,672.27