Finding the Fourth Proportional to 12,667.16, 18,981.30 and 7,729.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,667.16 : 18,981.30 = 7,729.40 : x
2. Step 2: Convert to fraction form
   12,667.16/18,981.30 = 7,729.40/x
3. Step 3: Cross multiply
   12,667.16x = 18,981.30 × 7,729.40
4. Step 4: Simplify right side
   12,667.16x = 146,714,060.22
5. Step 5: Solve for x
   x = 146,714,060.22/12,667.16
6. Step 6: Final answer
   x = 11,582.24