Finding the Fourth Proportional to 1,507.69, 2,081.03 and 918.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.69 : 2,081.03 = 918.22 : x
2. Step 2: Convert to fraction form
   1,507.69/2,081.03 = 918.22/x
3. Step 3: Cross multiply
   1,507.69x = 2,081.03 × 918.22
4. Step 4: Simplify right side
   1,507.69x = 1,910,838.78
5. Step 5: Solve for x
   x = 1,910,838.78/1,507.69
6. Step 6: Final answer
   x = 1,267.40