Finding the Fourth Proportional to 35,638.72, 53,499.46 and 20,858.24

Step by Step Solution

1. Step 1: Write the proportion equation
   35,638.72 : 53,499.46 = 20,858.24 : x
2. Step 2: Convert to fraction form
   35,638.72/53,499.46 = 20,858.24/x
3. Step 3: Cross multiply
   35,638.72x = 53,499.46 × 20,858.24
4. Step 4: Simplify right side
   35,638.72x = 1,115,904,576.55
5. Step 5: Solve for x
   x = 1,115,904,576.55/35,638.72
6. Step 6: Final answer
   x = 31,311.58