Finding the Fourth Proportional to 12,190.78, 16,824.52 and 8,790.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,190.78 : 16,824.52 = 8,790.59 : x
2. Step 2: Convert to fraction form
   12,190.78/16,824.52 = 8,790.59/x
3. Step 3: Cross multiply
   12,190.78x = 16,824.52 × 8,790.59
4. Step 4: Simplify right side
   12,190.78x = 147,897,510.32
5. Step 5: Solve for x
   x = 147,897,510.32/12,190.78
6. Step 6: Final answer
   x = 12,131.91