Finding the Fourth Proportional to 1,111.88, 1,665.92 and 623.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.88 : 1,665.92 = 623.72 : x
2. Step 2: Convert to fraction form
   1,111.88/1,665.92 = 623.72/x
3. Step 3: Cross multiply
   1,111.88x = 1,665.92 × 623.72
4. Step 4: Simplify right side
   1,111.88x = 1,039,067.62
5. Step 5: Solve for x
   x = 1,039,067.62/1,111.88
6. Step 6: Final answer
   x = 934.51