Finding the Fourth Proportional to 12,478.41, 17,219.70 and 7,440.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.41 : 17,219.70 = 7,440.03 : x
2. Step 2: Convert to fraction form
   12,478.41/17,219.70 = 7,440.03/x
3. Step 3: Cross multiply
   12,478.41x = 17,219.70 × 7,440.03
4. Step 4: Simplify right side
   12,478.41x = 128,115,084.59
5. Step 5: Solve for x
   x = 128,115,084.59/12,478.41
6. Step 6: Final answer
   x = 10,266.94