Finding the Fourth Proportional to 25,981.56, 38,978.10 and 12,123

Step by Step Solution

1. Step 1: Write the proportion equation
   25,981.56 : 38,978.10 = 12,123 : x
2. Step 2: Convert to fraction form
   25,981.56/38,978.10 = 12,123/x
3. Step 3: Cross multiply
   25,981.56x = 38,978.10 × 12,123
4. Step 4: Simplify right side
   25,981.56x = 472,531,506.30
5. Step 5: Solve for x
   x = 472,531,506.30/25,981.56
6. Step 6: Final answer
   x = 18,187.19