Finding the Fourth Proportional to 1,131.54, 1,561.05 and 799.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.54 : 1,561.05 = 799.98 : x
2. Step 2: Convert to fraction form
   1,131.54/1,561.05 = 799.98/x
3. Step 3: Cross multiply
   1,131.54x = 1,561.05 × 799.98
4. Step 4: Simplify right side
   1,131.54x = 1,248,808.78
5. Step 5: Solve for x
   x = 1,248,808.78/1,131.54
6. Step 6: Final answer
   x = 1,103.64