Finding the Fourth Proportional to 1,272.51, 1,756.62 and 800.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.51 : 1,756.62 = 800.82 : x
2. Step 2: Convert to fraction form
   1,272.51/1,756.62 = 800.82/x
3. Step 3: Cross multiply
   1,272.51x = 1,756.62 × 800.82
4. Step 4: Simplify right side
   1,272.51x = 1,406,736.43
5. Step 5: Solve for x
   x = 1,406,736.43/1,272.51
6. Step 6: Final answer
   x = 1,105.48