Finding the Fourth Proportional to 13,397.04, 18,487.81 and 7,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,397.04 : 18,487.81 = 7,428.72 : x
2. Step 2: Convert to fraction form
   13,397.04/18,487.81 = 7,428.72/x
3. Step 3: Cross multiply
   13,397.04x = 18,487.81 × 7,428.72
4. Step 4: Simplify right side
   13,397.04x = 137,340,842.52
5. Step 5: Solve for x
   x = 137,340,842.52/13,397.04
6. Step 6: Final answer
   x = 10,251.58