Finding the Fourth Proportional to 1,388.18, 1,928.56 and 1,375.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.18 : 1,928.56 = 1,375.50 : x
2. Step 2: Convert to fraction form
   1,388.18/1,928.56 = 1,375.50/x
3. Step 3: Cross multiply
   1,388.18x = 1,928.56 × 1,375.50
4. Step 4: Simplify right side
   1,388.18x = 2,652,734.28
5. Step 5: Solve for x
   x = 2,652,734.28/1,388.18
6. Step 6: Final answer
   x = 1,910.94