Finding the Fourth Proportional to 83,145.72, 114,735.80 and 45,420

Step by Step Solution

1. Step 1: Write the proportion equation
   83,145.72 : 114,735.80 = 45,420 : x
2. Step 2: Convert to fraction form
   83,145.72/114,735.80 = 45,420/x
3. Step 3: Cross multiply
   83,145.72x = 114,735.80 × 45,420
4. Step 4: Simplify right side
   83,145.72x = 5,211,300,036
5. Step 5: Solve for x
   x = 5,211,300,036/83,145.72
6. Step 6: Final answer
   x = 62,676.71