Finding the Fourth Proportional to 47,667.41, 71,501.54 and 12,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   47,667.41 : 71,501.54 = 12,128.78 : x
2. Step 2: Convert to fraction form
   47,667.41/71,501.54 = 12,128.78/x
3. Step 3: Cross multiply
   47,667.41x = 71,501.54 × 12,128.78
4. Step 4: Simplify right side
   47,667.41x = 867,226,448.32
5. Step 5: Solve for x
   x = 867,226,448.32/47,667.41
6. Step 6: Final answer
   x = 18,193.28