Finding the Fourth Proportional to 12,570.30, 18,859.40 and 5,178.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,570.30 : 18,859.40 = 5,178.24 : x
2. Step 2: Convert to fraction form
   12,570.30/18,859.40 = 5,178.24/x
3. Step 3: Cross multiply
   12,570.30x = 18,859.40 × 5,178.24
4. Step 4: Simplify right side
   12,570.30x = 97,658,499.46
5. Step 5: Solve for x
   x = 97,658,499.46/12,570.30
6. Step 6: Final answer
   x = 7,768.99