Finding the Fourth Proportional to 2,261.79, 3,389.71 and 1,222.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.79 : 3,389.71 = 1,222.06 : x
2. Step 2: Convert to fraction form
   2,261.79/3,389.71 = 1,222.06/x
3. Step 3: Cross multiply
   2,261.79x = 3,389.71 × 1,222.06
4. Step 4: Simplify right side
   2,261.79x = 4,142,405.94
5. Step 5: Solve for x
   x = 4,142,405.94/2,261.79
6. Step 6: Final answer
   x = 1,831.47