Finding the Fourth Proportional to 1,361.60, 1,878.98 and 764.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.60 : 1,878.98 = 764.15 : x
2. Step 2: Convert to fraction form
   1,361.60/1,878.98 = 764.15/x
3. Step 3: Cross multiply
   1,361.60x = 1,878.98 × 764.15
4. Step 4: Simplify right side
   1,361.60x = 1,435,809.35
5. Step 5: Solve for x
   x = 1,435,809.35/1,361.60
6. Step 6: Final answer
   x = 1,054.51