Finding the Fourth Proportional to 10,381.55, 15,575.31 and 5,118.14

Step by Step Solution

1. Step 1: Write the proportion equation
   10,381.55 : 15,575.31 = 5,118.14 : x
2. Step 2: Convert to fraction form
   10,381.55/15,575.31 = 5,118.14/x
3. Step 3: Cross multiply
   10,381.55x = 15,575.31 × 5,118.14
4. Step 4: Simplify right side
   10,381.55x = 79,716,539.25
5. Step 5: Solve for x
   x = 79,716,539.25/10,381.55
6. Step 6: Final answer
   x = 7,678.68