Finding the Fourth Proportional to 12,662.04, 18,990.82 and 3,428.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,662.04 : 18,990.82 = 3,428.76 : x
2. Step 2: Convert to fraction form
   12,662.04/18,990.82 = 3,428.76/x
3. Step 3: Cross multiply
   12,662.04x = 18,990.82 × 3,428.76
4. Step 4: Simplify right side
   12,662.04x = 65,114,963.98
5. Step 5: Solve for x
   x = 65,114,963.98/12,662.04
6. Step 6: Final answer
   x = 5,142.53