Finding the Fourth Proportional to 1,111.70, 1,666.62 and 623.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.70 : 1,666.62 = 623.87 : x
2. Step 2: Convert to fraction form
   1,111.70/1,666.62 = 623.87/x
3. Step 3: Cross multiply
   1,111.70x = 1,666.62 × 623.87
4. Step 4: Simplify right side
   1,111.70x = 1,039,745.89
5. Step 5: Solve for x
   x = 1,039,745.89/1,111.70
6. Step 6: Final answer
   x = 935.28