Finding the Fourth Proportional to 1,078.18, 1,621.55 and 914.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.18 : 1,621.55 = 914.15 : x
2. Step 2: Convert to fraction form
   1,078.18/1,621.55 = 914.15/x
3. Step 3: Cross multiply
   1,078.18x = 1,621.55 × 914.15
4. Step 4: Simplify right side
   1,078.18x = 1,482,346.27
5. Step 5: Solve for x
   x = 1,482,346.27/1,078.18
6. Step 6: Final answer
   x = 1,374.86