Finding the Fourth Proportional to 1,112.32, 1,668.78 and 625.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.32 : 1,668.78 = 625.72 : x
2. Step 2: Convert to fraction form
   1,112.32/1,668.78 = 625.72/x
3. Step 3: Cross multiply
   1,112.32x = 1,668.78 × 625.72
4. Step 4: Simplify right side
   1,112.32x = 1,044,189.02
5. Step 5: Solve for x
   x = 1,044,189.02/1,112.32
6. Step 6: Final answer
   x = 938.75