Finding the Fourth Proportional to 1,272.51, 1,756.61 and 775.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.51 : 1,756.61 = 775.34 : x
2. Step 2: Convert to fraction form
   1,272.51/1,756.61 = 775.34/x
3. Step 3: Cross multiply
   1,272.51x = 1,756.61 × 775.34
4. Step 4: Simplify right side
   1,272.51x = 1,361,957.34
5. Step 5: Solve for x
   x = 1,361,957.34/1,272.51
6. Step 6: Final answer
   x = 1,070.29