Finding the Fourth Proportional to 12,611.72, 18,870.87 and 7,894.14

Step by Step Solution

1. Step 1: Write the proportion equation
   12,611.72 : 18,870.87 = 7,894.14 : x
2. Step 2: Convert to fraction form
   12,611.72/18,870.87 = 7,894.14/x
3. Step 3: Cross multiply
   12,611.72x = 18,870.87 × 7,894.14
4. Step 4: Simplify right side
   12,611.72x = 148,969,360.47
5. Step 5: Solve for x
   x = 148,969,360.47/12,611.72
6. Step 6: Final answer
   x = 11,811.98