Finding the Fourth Proportional to 2,061.32, 2,844.60 and 1,221.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.32 : 2,844.60 = 1,221.80 : x
2. Step 2: Convert to fraction form
   2,061.32/2,844.60 = 1,221.80/x
3. Step 3: Cross multiply
   2,061.32x = 2,844.60 × 1,221.80
4. Step 4: Simplify right side
   2,061.32x = 3,475,532.28
5. Step 5: Solve for x
   x = 3,475,532.28/2,061.32
6. Step 6: Final answer
   x = 1,686.07