Finding the Fourth Proportional to 12,940.74, 17,856.72 and 7,274.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.74 : 17,856.72 = 7,274.70 : x
2. Step 2: Convert to fraction form
   12,940.74/17,856.72 = 7,274.70/x
3. Step 3: Cross multiply
   12,940.74x = 17,856.72 × 7,274.70
4. Step 4: Simplify right side
   12,940.74x = 129,902,280.98
5. Step 5: Solve for x
   x = 129,902,280.98/12,940.74
6. Step 6: Final answer
   x = 10,038.24