Finding the Fourth Proportional to 3,112.72, 4,669.20 and 1,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.72 : 4,669.20 = 1,164.72 : x
2. Step 2: Convert to fraction form
   3,112.72/4,669.20 = 1,164.72/x
3. Step 3: Cross multiply
   3,112.72x = 4,669.20 × 1,164.72
4. Step 4: Simplify right side
   3,112.72x = 5,438,310.62
5. Step 5: Solve for x
   x = 5,438,310.62/3,112.72
6. Step 6: Final answer
   x = 1,747.12