Finding the Fourth Proportional to 17,574.72, 26,366.40 and 12,390.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,574.72 : 26,366.40 = 12,390.72 : x
2. Step 2: Convert to fraction form
   17,574.72/26,366.40 = 12,390.72/x
3. Step 3: Cross multiply
   17,574.72x = 26,366.40 × 12,390.72
4. Step 4: Simplify right side
   17,574.72x = 326,698,679.81
5. Step 5: Solve for x
   x = 326,698,679.81/17,574.72
6. Step 6: Final answer
   x = 18,589.13