Finding the Fourth Proportional to 13,178.57, 18,185.94 and 7,870.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,178.57 : 18,185.94 = 7,870.23 : x
2. Step 2: Convert to fraction form
   13,178.57/18,185.94 = 7,870.23/x
3. Step 3: Cross multiply
   13,178.57x = 18,185.94 × 7,870.23
4. Step 4: Simplify right side
   13,178.57x = 143,127,530.57
5. Step 5: Solve for x
   x = 143,127,530.57/13,178.57
6. Step 6: Final answer
   x = 10,860.63