Finding the Fourth Proportional to 1,507.86, 2,080.28 and 918.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.86 : 2,080.28 = 918.18 : x
2. Step 2: Convert to fraction form
   1,507.86/2,080.28 = 918.18/x
3. Step 3: Cross multiply
   1,507.86x = 2,080.28 × 918.18
4. Step 4: Simplify right side
   1,507.86x = 1,910,071.49
5. Step 5: Solve for x
   x = 1,910,071.49/1,507.86
6. Step 6: Final answer
   x = 1,266.74