Finding the Fourth Proportional to 389,443, 537,431.37 and 210,595

Step by Step Solution

1. Step 1: Write the proportion equation
   389,443 : 537,431.37 = 210,595 : x
2. Step 2: Convert to fraction form
   389,443/537,431.37 = 210,595/x
3. Step 3: Cross multiply
   389,443x = 537,431.37 × 210,595
4. Step 4: Simplify right side
   389,443x = 113,180,359,365.15
5. Step 5: Solve for x
   x = 113,180,359,365.15/389,443
6. Step 6: Final answer
   x = 290,621.12