Finding the Fourth Proportional to 10,158.31, 14,018.51 and 5,681.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,158.31 : 14,018.51 = 5,681.78 : x
2. Step 2: Convert to fraction form
   10,158.31/14,018.51 = 5,681.78/x
3. Step 3: Cross multiply
   10,158.31x = 14,018.51 × 5,681.78
4. Step 4: Simplify right side
   10,158.31x = 79,649,991.25
5. Step 5: Solve for x
   x = 79,649,991.25/10,158.31
6. Step 6: Final answer
   x = 7,840.87