Finding the Fourth Proportional to 1,507.84, 2,080.71 and 918.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.84 : 2,080.71 = 918.28 : x
2. Step 2: Convert to fraction form
   1,507.84/2,080.71 = 918.28/x
3. Step 3: Cross multiply
   1,507.84x = 2,080.71 × 918.28
4. Step 4: Simplify right side
   1,507.84x = 1,910,674.38
5. Step 5: Solve for x
   x = 1,910,674.38/1,507.84
6. Step 6: Final answer
   x = 1,267.16