Finding the Fourth Proportional to 1,507.76, 2,080.89 and 918.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.76 : 2,080.89 = 918.38 : x
2. Step 2: Convert to fraction form
   1,507.76/2,080.89 = 918.38/x
3. Step 3: Cross multiply
   1,507.76x = 2,080.89 × 918.38
4. Step 4: Simplify right side
   1,507.76x = 1,911,047.76
5. Step 5: Solve for x
   x = 1,911,047.76/1,507.76
6. Step 6: Final answer
   x = 1,267.47