Finding the Fourth Proportional to 57,105.37, 85,563.69 and 19,645.30

Step by Step Solution

1. Step 1: Write the proportion equation
   57,105.37 : 85,563.69 = 19,645.30 : x
2. Step 2: Convert to fraction form
   57,105.37/85,563.69 = 19,645.30/x
3. Step 3: Cross multiply
   57,105.37x = 85,563.69 × 19,645.30
4. Step 4: Simplify right side
   57,105.37x = 1,680,924,359.16
5. Step 5: Solve for x
   x = 1,680,924,359.16/57,105.37
6. Step 6: Final answer
   x = 29,435.49