Finding the Fourth Proportional to 1,109.80, 1,665.42 and 623.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.80 : 1,665.42 = 623.08 : x
2. Step 2: Convert to fraction form
   1,109.80/1,665.42 = 623.08/x
3. Step 3: Cross multiply
   1,109.80x = 1,665.42 × 623.08
4. Step 4: Simplify right side
   1,109.80x = 1,037,689.89
5. Step 5: Solve for x
   x = 1,037,689.89/1,109.80
6. Step 6: Final answer
   x = 935.02