Finding the Fourth Proportional to 1,405.50, 1,939.38 and 816.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.50 : 1,939.38 = 816.18 : x
2. Step 2: Convert to fraction form
   1,405.50/1,939.38 = 816.18/x
3. Step 3: Cross multiply
   1,405.50x = 1,939.38 × 816.18
4. Step 4: Simplify right side
   1,405.50x = 1,582,883.17
5. Step 5: Solve for x
   x = 1,582,883.17/1,405.50
6. Step 6: Final answer
   x = 1,126.21