Finding the Fourth Proportional to 1,098.86, 1,641.99 and 1,078.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.86 : 1,641.99 = 1,078.34 : x
2. Step 2: Convert to fraction form
   1,098.86/1,641.99 = 1,078.34/x
3. Step 3: Cross multiply
   1,098.86x = 1,641.99 × 1,078.34
4. Step 4: Simplify right side
   1,098.86x = 1,770,618.10
5. Step 5: Solve for x
   x = 1,770,618.10/1,098.86
6. Step 6: Final answer
   x = 1,611.32