Finding the Fourth Proportional to 1,139.50, 1,709.61 and 626.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.50 : 1,709.61 = 626.86 : x
2. Step 2: Convert to fraction form
   1,139.50/1,709.61 = 626.86/x
3. Step 3: Cross multiply
   1,139.50x = 1,709.61 × 626.86
4. Step 4: Simplify right side
   1,139.50x = 1,071,686.12
5. Step 5: Solve for x
   x = 1,071,686.12/1,139.50
6. Step 6: Final answer
   x = 940.49