Finding the Fourth Proportional to 43,375.12, 65,062.88 and 13,389

Step by Step Solution

1. Step 1: Write the proportion equation
   43,375.12 : 65,062.88 = 13,389 : x
2. Step 2: Convert to fraction form
   43,375.12/65,062.88 = 13,389/x
3. Step 3: Cross multiply
   43,375.12x = 65,062.88 × 13,389
4. Step 4: Simplify right side
   43,375.12x = 871,126,900.32
5. Step 5: Solve for x
   x = 871,126,900.32/43,375.12
6. Step 6: Final answer
   x = 20,083.56