Finding the Fourth Proportional to 22,188.32, 30,618.69 and 12,992.67

Step by Step Solution

1. Step 1: Write the proportion equation
   22,188.32 : 30,618.69 = 12,992.67 : x
2. Step 2: Convert to fraction form
   22,188.32/30,618.69 = 12,992.67/x
3. Step 3: Cross multiply
   22,188.32x = 30,618.69 × 12,992.67
4. Step 4: Simplify right side
   22,188.32x = 397,818,535.00
5. Step 5: Solve for x
   x = 397,818,535.00/22,188.32
6. Step 6: Final answer
   x = 17,929.18