Finding the Fourth Proportional to 17,573.72, 26,364.90 and 12,389.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,573.72 : 26,364.90 = 12,389.72 : x
2. Step 2: Convert to fraction form
   17,573.72/26,364.90 = 12,389.72/x
3. Step 3: Cross multiply
   17,573.72x = 26,364.90 × 12,389.72
4. Step 4: Simplify right side
   17,573.72x = 326,653,728.83
5. Step 5: Solve for x
   x = 326,653,728.83/17,573.72
6. Step 6: Final answer
   x = 18,587.63