Finding the Fourth Proportional to 1,236.42, 1,705.50 and 764.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,236.42 : 1,705.50 = 764.55 : x
2. Step 2: Convert to fraction form
   1,236.42/1,705.50 = 764.55/x
3. Step 3: Cross multiply
   1,236.42x = 1,705.50 × 764.55
4. Step 4: Simplify right side
   1,236.42x = 1,303,940.03
5. Step 5: Solve for x
   x = 1,303,940.03/1,236.42
6. Step 6: Final answer
   x = 1,054.61