Finding the Fourth Proportional to 12,981.98, 19,472.95 and 3,121.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.98 : 19,472.95 = 3,121.25 : x
2. Step 2: Convert to fraction form
   12,981.98/19,472.95 = 3,121.25/x
3. Step 3: Cross multiply
   12,981.98x = 19,472.95 × 3,121.25
4. Step 4: Simplify right side
   12,981.98x = 60,779,945.19
5. Step 5: Solve for x
   x = 60,779,945.19/12,981.98
6. Step 6: Final answer
   x = 4,681.87