Finding the Fourth Proportional to 1,111.05, 1,665.70 and 623.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,665.70 = 623.97 : x
2. Step 2: Convert to fraction form
   1,111.05/1,665.70 = 623.97/x
3. Step 3: Cross multiply
   1,111.05x = 1,665.70 × 623.97
4. Step 4: Simplify right side
   1,111.05x = 1,039,345.27
5. Step 5: Solve for x
   x = 1,039,345.27/1,111.05
6. Step 6: Final answer
   x = 935.46