Finding the Fourth Proportional to 3,076.50, 4,612.50 and 1,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,076.50 : 4,612.50 = 1,128.72 : x
2. Step 2: Convert to fraction form
   3,076.50/4,612.50 = 1,128.72/x
3. Step 3: Cross multiply
   3,076.50x = 4,612.50 × 1,128.72
4. Step 4: Simplify right side
   3,076.50x = 5,206,221
5. Step 5: Solve for x
   x = 5,206,221/3,076.50
6. Step 6: Final answer
   x = 1,692.25