Finding the Fourth Proportional to 12,012.31, 18,015.90 and 4,614.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,012.31 : 18,015.90 = 4,614.18 : x
2. Step 2: Convert to fraction form
   12,012.31/18,015.90 = 4,614.18/x
3. Step 3: Cross multiply
   12,012.31x = 18,015.90 × 4,614.18
4. Step 4: Simplify right side
   12,012.31x = 83,128,605.46
5. Step 5: Solve for x
   x = 83,128,605.46/12,012.31
6. Step 6: Final answer
   x = 6,920.28