Finding the Fourth Proportional to 7,146.53, 10,721.71 and 2,985.15

Step by Step Solution

1. Step 1: Write the proportion equation
   7,146.53 : 10,721.71 = 2,985.15 : x
2. Step 2: Convert to fraction form
   7,146.53/10,721.71 = 2,985.15/x
3. Step 3: Cross multiply
   7,146.53x = 10,721.71 × 2,985.15
4. Step 4: Simplify right side
   7,146.53x = 32,005,912.61
5. Step 5: Solve for x
   x = 32,005,912.61/7,146.53
6. Step 6: Final answer
   x = 4,478.53