Finding the Fourth Proportional to 43,510.91, 65,274.53 and 13,920.80

Step by Step Solution

1. Step 1: Write the proportion equation
   43,510.91 : 65,274.53 = 13,920.80 : x
2. Step 2: Convert to fraction form
   43,510.91/65,274.53 = 13,920.80/x
3. Step 3: Cross multiply
   43,510.91x = 65,274.53 × 13,920.80
4. Step 4: Simplify right side
   43,510.91x = 908,673,281.25
5. Step 5: Solve for x
   x = 908,673,281.25/43,510.91
6. Step 6: Final answer
   x = 20,883.81