Finding the Fourth Proportional to 12,958.80, 19,434.56 and 3,596.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,958.80 : 19,434.56 = 3,596.55 : x
2. Step 2: Convert to fraction form
   12,958.80/19,434.56 = 3,596.55/x
3. Step 3: Cross multiply
   12,958.80x = 19,434.56 × 3,596.55
4. Step 4: Simplify right side
   12,958.80x = 69,897,348.79
5. Step 5: Solve for x
   x = 69,897,348.79/12,958.80
6. Step 6: Final answer
   x = 5,393.81