Finding the Fourth Proportional to 13,158.38, 18,158.03 and 7,784.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.38 : 18,158.03 = 7,784.30 : x
2. Step 2: Convert to fraction form
   13,158.38/18,158.03 = 7,784.30/x
3. Step 3: Cross multiply
   13,158.38x = 18,158.03 × 7,784.30
4. Step 4: Simplify right side
   13,158.38x = 141,347,423.22
5. Step 5: Solve for x
   x = 141,347,423.22/13,158.38
6. Step 6: Final answer
   x = 10,742.01