Finding the Fourth Proportional to 1,356.15, 1,871.28 and 766.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.15 : 1,871.28 = 766.56 : x
2. Step 2: Convert to fraction form
   1,356.15/1,871.28 = 766.56/x
3. Step 3: Cross multiply
   1,356.15x = 1,871.28 × 766.56
4. Step 4: Simplify right side
   1,356.15x = 1,434,448.40
5. Step 5: Solve for x
   x = 1,434,448.40/1,356.15
6. Step 6: Final answer
   x = 1,057.74