Finding the Fourth Proportional to 11,258.31, 15,538.61 and 7,423.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,258.31 : 15,538.61 = 7,423.20 : x
2. Step 2: Convert to fraction form
   11,258.31/15,538.61 = 7,423.20/x
3. Step 3: Cross multiply
   11,258.31x = 15,538.61 × 7,423.20
4. Step 4: Simplify right side
   11,258.31x = 115,346,200.47
5. Step 5: Solve for x
   x = 115,346,200.47/11,258.31
6. Step 6: Final answer
   x = 10,245.43