Finding the Fourth Proportional to 13,199.55, 18,210.83 and 7,530.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,199.55 : 18,210.83 = 7,530.21 : x
2. Step 2: Convert to fraction form
   13,199.55/18,210.83 = 7,530.21/x
3. Step 3: Cross multiply
   13,199.55x = 18,210.83 × 7,530.21
4. Step 4: Simplify right side
   13,199.55x = 137,131,374.17
5. Step 5: Solve for x
   x = 137,131,374.17/13,199.55
6. Step 6: Final answer
   x = 10,389.09