Finding the Fourth Proportional to 12,965.40, 19,445.40 and 5,570.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,965.40 : 19,445.40 = 5,570.10 : x
2. Step 2: Convert to fraction form
   12,965.40/19,445.40 = 5,570.10/x
3. Step 3: Cross multiply
   12,965.40x = 19,445.40 × 5,570.10
4. Step 4: Simplify right side
   12,965.40x = 108,312,822.54
5. Step 5: Solve for x
   x = 108,312,822.54/12,965.40
6. Step 6: Final answer
   x = 8,353.99