Finding the Fourth Proportional to 1,222.79, 1,686.17 and 943.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.79 : 1,686.17 = 943.07 : x
2. Step 2: Convert to fraction form
   1,222.79/1,686.17 = 943.07/x
3. Step 3: Cross multiply
   1,222.79x = 1,686.17 × 943.07
4. Step 4: Simplify right side
   1,222.79x = 1,590,170.27
5. Step 5: Solve for x
   x = 1,590,170.27/1,222.79
6. Step 6: Final answer
   x = 1,300.45