Finding the Fourth Proportional to 11,939.10, 17,920.76 and 4,923.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,939.10 : 17,920.76 = 4,923.31 : x
2. Step 2: Convert to fraction form
   11,939.10/17,920.76 = 4,923.31/x
3. Step 3: Cross multiply
   11,939.10x = 17,920.76 × 4,923.31
4. Step 4: Simplify right side
   11,939.10x = 88,229,491.02
5. Step 5: Solve for x
   x = 88,229,491.02/11,939.10
6. Step 6: Final answer
   x = 7,389.96