Finding the Fourth Proportional to 1,375.60, 2,066.56 and 889.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.60 : 2,066.56 = 889.60 : x
2. Step 2: Convert to fraction form
   1,375.60/2,066.56 = 889.60/x
3. Step 3: Cross multiply
   1,375.60x = 2,066.56 × 889.60
4. Step 4: Simplify right side
   1,375.60x = 1,838,411.78
5. Step 5: Solve for x
   x = 1,838,411.78/1,375.60
6. Step 6: Final answer
   x = 1,336.44