Finding the Fourth Proportional to 1,108.50, 1,529.86 and 813.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.50 : 1,529.86 = 813.86 : x
2. Step 2: Convert to fraction form
   1,108.50/1,529.86 = 813.86/x
3. Step 3: Cross multiply
   1,108.50x = 1,529.86 × 813.86
4. Step 4: Simplify right side
   1,108.50x = 1,245,091.86
5. Step 5: Solve for x
   x = 1,245,091.86/1,108.50
6. Step 6: Final answer
   x = 1,123.22