Finding the Fourth Proportional to 12,989.28, 19,472.20 and 4,667.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.28 : 19,472.20 = 4,667.34 : x
2. Step 2: Convert to fraction form
   12,989.28/19,472.20 = 4,667.34/x
3. Step 3: Cross multiply
   12,989.28x = 19,472.20 × 4,667.34
4. Step 4: Simplify right side
   12,989.28x = 90,883,377.95
5. Step 5: Solve for x
   x = 90,883,377.95/12,989.28
6. Step 6: Final answer
   x = 6,996.80