Finding the Fourth Proportional to 10,103.67, 15,156.72 and 5,171.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,103.67 : 15,156.72 = 5,171.99 : x
2. Step 2: Convert to fraction form
   10,103.67/15,156.72 = 5,171.99/x
3. Step 3: Cross multiply
   10,103.67x = 15,156.72 × 5,171.99
4. Step 4: Simplify right side
   10,103.67x = 78,390,328.49
5. Step 5: Solve for x
   x = 78,390,328.49/10,103.67
6. Step 6: Final answer
   x = 7,758.60