Finding the Fourth Proportional to 20,308.80, 30,460.05 and 7,158.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,308.80 : 30,460.05 = 7,158.10 : x
2. Step 2: Convert to fraction form
   20,308.80/30,460.05 = 7,158.10/x
3. Step 3: Cross multiply
   20,308.80x = 30,460.05 × 7,158.10
4. Step 4: Simplify right side
   20,308.80x = 218,035,979.20
5. Step 5: Solve for x
   x = 218,035,979.20/20,308.80
6. Step 6: Final answer
   x = 10,736.03