Finding the Fourth Proportional to 10,045.98, 15,078.31 and 5,119.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,045.98 : 15,078.31 = 5,119.31 : x
2. Step 2: Convert to fraction form
   10,045.98/15,078.31 = 5,119.31/x
3. Step 3: Cross multiply
   10,045.98x = 15,078.31 × 5,119.31
4. Step 4: Simplify right side
   10,045.98x = 77,190,568.06
5. Step 5: Solve for x
   x = 77,190,568.06/10,045.98
6. Step 6: Final answer
   x = 7,683.73