Finding the Fourth Proportional to 7,012.72, 10,517.46 and 3,115

Step by Step Solution

1. Step 1: Write the proportion equation
   7,012.72 : 10,517.46 = 3,115 : x
2. Step 2: Convert to fraction form
   7,012.72/10,517.46 = 3,115/x
3. Step 3: Cross multiply
   7,012.72x = 10,517.46 × 3,115
4. Step 4: Simplify right side
   7,012.72x = 32,761,887.90
5. Step 5: Solve for x
   x = 32,761,887.90/7,012.72
6. Step 6: Final answer
   x = 4,671.78