Finding the Fourth Proportional to 47,491.76, 71,211.30 and 19,431.50

Step by Step Solution

1. Step 1: Write the proportion equation
   47,491.76 : 71,211.30 = 19,431.50 : x
2. Step 2: Convert to fraction form
   47,491.76/71,211.30 = 19,431.50/x
3. Step 3: Cross multiply
   47,491.76x = 71,211.30 × 19,431.50
4. Step 4: Simplify right side
   47,491.76x = 1,383,742,019.89
5. Step 5: Solve for x
   x = 1,383,742,019.89/47,491.76
6. Step 6: Final answer
   x = 29,136.47