Finding the Fourth Proportional to 12,854.30, 17,738.81 and 7,188.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,854.30 : 17,738.81 = 7,188.98 : x
2. Step 2: Convert to fraction form
   12,854.30/17,738.81 = 7,188.98/x
3. Step 3: Cross multiply
   12,854.30x = 17,738.81 × 7,188.98
4. Step 4: Simplify right side
   12,854.30x = 127,523,950.31
5. Step 5: Solve for x
   x = 127,523,950.31/12,854.30
6. Step 6: Final answer
   x = 9,920.72