Finding the Fourth Proportional to 65,405.43, 90,245.52 and 38,538.15

Step by Step Solution

1. Step 1: Write the proportion equation
   65,405.43 : 90,245.52 = 38,538.15 : x
2. Step 2: Convert to fraction form
   65,405.43/90,245.52 = 38,538.15/x
3. Step 3: Cross multiply
   65,405.43x = 90,245.52 × 38,538.15
4. Step 4: Simplify right side
   65,405.43x = 3,477,895,386.59
5. Step 5: Solve for x
   x = 3,477,895,386.59/65,405.43
6. Step 6: Final answer
   x = 53,174.41