Finding the Fourth Proportional to 1,011.34, 1,393.76 and 789.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.34 : 1,393.76 = 789.94 : x
2. Step 2: Convert to fraction form
   1,011.34/1,393.76 = 789.94/x
3. Step 3: Cross multiply
   1,011.34x = 1,393.76 × 789.94
4. Step 4: Simplify right side
   1,011.34x = 1,100,986.77
5. Step 5: Solve for x
   x = 1,100,986.77/1,011.34
6. Step 6: Final answer
   x = 1,088.64