Finding the Fourth Proportional to 1,041.78, 1,436.30 and 864.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.78 : 1,436.30 = 864.10 : x
2. Step 2: Convert to fraction form
   1,041.78/1,436.30 = 864.10/x
3. Step 3: Cross multiply
   1,041.78x = 1,436.30 × 864.10
4. Step 4: Simplify right side
   1,041.78x = 1,241,106.83
5. Step 5: Solve for x
   x = 1,241,106.83/1,041.78
6. Step 6: Final answer
   x = 1,191.33