Finding the Fourth Proportional to 13,210.81, 18,230.71 and 7,242.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,210.81 : 18,230.71 = 7,242.52 : x
2. Step 2: Convert to fraction form
   13,210.81/18,230.71 = 7,242.52/x
3. Step 3: Cross multiply
   13,210.81x = 18,230.71 × 7,242.52
4. Step 4: Simplify right side
   13,210.81x = 132,036,204.53
5. Step 5: Solve for x
   x = 132,036,204.53/13,210.81
6. Step 6: Final answer
   x = 9,994.56