Finding the Fourth Proportional to 17,474.76, 24,072.84 and 12,990.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,474.76 : 24,072.84 = 12,990.78 : x
2. Step 2: Convert to fraction form
   17,474.76/24,072.84 = 12,990.78/x
3. Step 3: Cross multiply
   17,474.76x = 24,072.84 × 12,990.78
4. Step 4: Simplify right side
   17,474.76x = 312,724,968.42
5. Step 5: Solve for x
   x = 312,724,968.42/17,474.76
6. Step 6: Final answer
   x = 17,895.81