Finding the Fourth Proportional to 9,381.81, 12,947.21 and 5,190.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,381.81 : 12,947.21 = 5,190.06 : x
2. Step 2: Convert to fraction form
   9,381.81/12,947.21 = 5,190.06/x
3. Step 3: Cross multiply
   9,381.81x = 12,947.21 × 5,190.06
4. Step 4: Simplify right side
   9,381.81x = 67,196,796.73
5. Step 5: Solve for x
   x = 67,196,796.73/9,381.81
6. Step 6: Final answer
   x = 7,162.46