Finding the Fourth Proportional to 13,090.50, 18,064.78 and 7,426.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,090.50 : 18,064.78 = 7,426.47 : x
2. Step 2: Convert to fraction form
   13,090.50/18,064.78 = 7,426.47/x
3. Step 3: Cross multiply
   13,090.50x = 18,064.78 × 7,426.47
4. Step 4: Simplify right side
   13,090.50x = 134,157,546.73
5. Step 5: Solve for x
   x = 134,157,546.73/13,090.50
6. Step 6: Final answer
   x = 10,248.47