Finding the Fourth Proportional to 389,687, 537,768.06 and 210,839

Step by Step Solution

1. Step 1: Write the proportion equation
   389,687 : 537,768.06 = 210,839 : x
2. Step 2: Convert to fraction form
   389,687/537,768.06 = 210,839/x
3. Step 3: Cross multiply
   389,687x = 537,768.06 × 210,839
4. Step 4: Simplify right side
   389,687x = 113,382,480,002.34
5. Step 5: Solve for x
   x = 113,382,480,002.34/389,687
6. Step 6: Final answer
   x = 290,957.82