Finding the Fourth Proportional to 31,409.60, 47,123.55 and 12,680.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,409.60 : 47,123.55 = 12,680.06 : x
2. Step 2: Convert to fraction form
   31,409.60/47,123.55 = 12,680.06/x
3. Step 3: Cross multiply
   31,409.60x = 47,123.55 × 12,680.06
4. Step 4: Simplify right side
   31,409.60x = 597,529,205.80
5. Step 5: Solve for x
   x = 597,529,205.80/31,409.60
6. Step 6: Final answer
   x = 19,023.78