Finding the Fourth Proportional to 35,965.31, 53,910.51 and 20,147.15

Step by Step Solution

1. Step 1: Write the proportion equation
   35,965.31 : 53,910.51 = 20,147.15 : x
2. Step 2: Convert to fraction form
   35,965.31/53,910.51 = 20,147.15/x
3. Step 3: Cross multiply
   35,965.31x = 53,910.51 × 20,147.15
4. Step 4: Simplify right side
   35,965.31x = 1,086,143,131.55
5. Step 5: Solve for x
   x = 1,086,143,131.55/35,965.31
6. Step 6: Final answer
   x = 30,199.74