Finding the Fourth Proportional to 13,389.45, 18,476.01 and 7,420.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,389.45 : 18,476.01 = 7,420.98 : x
2. Step 2: Convert to fraction form
   13,389.45/18,476.01 = 7,420.98/x
3. Step 3: Cross multiply
   13,389.45x = 18,476.01 × 7,420.98
4. Step 4: Simplify right side
   13,389.45x = 137,110,100.69
5. Step 5: Solve for x
   x = 137,110,100.69/13,389.45
6. Step 6: Final answer
   x = 10,240.16