Finding the Fourth Proportional to 1,507.78, 2,080.80 and 844.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.78 : 2,080.80 = 844.72 : x
2. Step 2: Convert to fraction form
   1,507.78/2,080.80 = 844.72/x
3. Step 3: Cross multiply
   1,507.78x = 2,080.80 × 844.72
4. Step 4: Simplify right side
   1,507.78x = 1,757,693.38
5. Step 5: Solve for x
   x = 1,757,693.38/1,507.78
6. Step 6: Final answer
   x = 1,165.75