Finding the Fourth Proportional to 1,359.78, 1,876.20 and 800.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.78 : 1,876.20 = 800.10 : x
2. Step 2: Convert to fraction form
   1,359.78/1,876.20 = 800.10/x
3. Step 3: Cross multiply
   1,359.78x = 1,876.20 × 800.10
4. Step 4: Simplify right side
   1,359.78x = 1,501,147.62
5. Step 5: Solve for x
   x = 1,501,147.62/1,359.78
6. Step 6: Final answer
   x = 1,103.96