Finding the Fourth Proportional to 12,981.20, 19,473.72 and 5,189.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.20 : 19,473.72 = 5,189.84 : x
2. Step 2: Convert to fraction form
   12,981.20/19,473.72 = 5,189.84/x
3. Step 3: Cross multiply
   12,981.20x = 19,473.72 × 5,189.84
4. Step 4: Simplify right side
   12,981.20x = 101,065,491.00
5. Step 5: Solve for x
   x = 101,065,491.00/12,981.20
6. Step 6: Final answer
   x = 7,785.53