Finding the Fourth Proportional to 1,139.69, 1,709.98 and 922.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.69 : 1,709.98 = 922.34 : x
2. Step 2: Convert to fraction form
   1,139.69/1,709.98 = 922.34/x
3. Step 3: Cross multiply
   1,139.69x = 1,709.98 × 922.34
4. Step 4: Simplify right side
   1,139.69x = 1,577,184.92
5. Step 5: Solve for x
   x = 1,577,184.92/1,139.69
6. Step 6: Final answer
   x = 1,383.87