Finding the Fourth Proportional to 10,105.45, 15,148.78 and 5,164.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,105.45 : 15,148.78 = 5,164.18 : x
2. Step 2: Convert to fraction form
   10,105.45/15,148.78 = 5,164.18/x
3. Step 3: Cross multiply
   10,105.45x = 15,148.78 × 5,164.18
4. Step 4: Simplify right side
   10,105.45x = 78,231,026.70
5. Step 5: Solve for x
   x = 78,231,026.70/10,105.45
6. Step 6: Final answer
   x = 7,741.47