Finding the Fourth Proportional to 10,139.16, 15,196.43 and 5,212.94

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.16 : 15,196.43 = 5,212.94 : x
2. Step 2: Convert to fraction form
   10,139.16/15,196.43 = 5,212.94/x
3. Step 3: Cross multiply
   10,139.16x = 15,196.43 × 5,212.94
4. Step 4: Simplify right side
   10,139.16x = 79,217,975.76
5. Step 5: Solve for x
   x = 79,217,975.76/10,139.16
6. Step 6: Final answer
   x = 7,813.07