Finding the Fourth Proportional to 13,406.95, 18,501.54 and 7,439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.95 : 18,501.54 = 7,439.50 : x
2. Step 2: Convert to fraction form
   13,406.95/18,501.54 = 7,439.50/x
3. Step 3: Cross multiply
   13,406.95x = 18,501.54 × 7,439.50
4. Step 4: Simplify right side
   13,406.95x = 137,642,206.83
5. Step 5: Solve for x
   x = 137,642,206.83/13,406.95
6. Step 6: Final answer
   x = 10,266.48