Finding the Fourth Proportional to 1,109.82, 1,665.42 and 623.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.82 : 1,665.42 = 623.20 : x
2. Step 2: Convert to fraction form
   1,109.82/1,665.42 = 623.20/x
3. Step 3: Cross multiply
   1,109.82x = 1,665.42 × 623.20
4. Step 4: Simplify right side
   1,109.82x = 1,037,889.74
5. Step 5: Solve for x
   x = 1,037,889.74/1,109.82
6. Step 6: Final answer
   x = 935.19