Finding the Fourth Proportional to 12,981.72, 19,472.58 and 3,121.00

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.72 : 19,472.58 = 3,121.00 : x
2. Step 2: Convert to fraction form
   12,981.72/19,472.58 = 3,121.00/x
3. Step 3: Cross multiply
   12,981.72x = 19,472.58 × 3,121.00
4. Step 4: Simplify right side
   12,981.72x = 60,773,857.89
5. Step 5: Solve for x
   x = 60,773,857.89/12,981.72
6. Step 6: Final answer
   x = 4,681.49