Finding the Fourth Proportional to 1,155.35, 1,730.42 and 810.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.35 : 1,730.42 = 810.22 : x
2. Step 2: Convert to fraction form
   1,155.35/1,730.42 = 810.22/x
3. Step 3: Cross multiply
   1,155.35x = 1,730.42 × 810.22
4. Step 4: Simplify right side
   1,155.35x = 1,402,020.89
5. Step 5: Solve for x
   x = 1,402,020.89/1,155.35
6. Step 6: Final answer
   x = 1,213.50