Finding the Fourth Proportional to 12,578.05, 17,368.73 and 7,870.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.05 : 17,368.73 = 7,870.33 : x
2. Step 2: Convert to fraction form
   12,578.05/17,368.73 = 7,870.33/x
3. Step 3: Cross multiply
   12,578.05x = 17,368.73 × 7,870.33
4. Step 4: Simplify right side
   12,578.05x = 136,697,636.78
5. Step 5: Solve for x
   x = 136,697,636.78/12,578.05
6. Step 6: Final answer
   x = 10,867.95