Finding the Fourth Proportional to 13,215.74, 19,831.61 and 5,320.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,215.74 : 19,831.61 = 5,320.01 : x
2. Step 2: Convert to fraction form
   13,215.74/19,831.61 = 5,320.01/x
3. Step 3: Cross multiply
   13,215.74x = 19,831.61 × 5,320.01
4. Step 4: Simplify right side
   13,215.74x = 105,504,237.76
5. Step 5: Solve for x
   x = 105,504,237.76/13,215.74
6. Step 6: Final answer
   x = 7,983.23