Finding the Fourth Proportional to 13,389.94, 18,477.61 and 7,421.46

Step by Step Solution

1. Step 1: Write the proportion equation
   13,389.94 : 18,477.61 = 7,421.46 : x
2. Step 2: Convert to fraction form
   13,389.94/18,477.61 = 7,421.46/x
3. Step 3: Cross multiply
   13,389.94x = 18,477.61 × 7,421.46
4. Step 4: Simplify right side
   13,389.94x = 137,130,843.51
5. Step 5: Solve for x
   x = 137,130,843.51/13,389.94
6. Step 6: Final answer
   x = 10,241.33