Finding the Fourth Proportional to 369,886.40, 510,443.98 and 206,542.10

Step by Step Solution

1. Step 1: Write the proportion equation
   369,886.40 : 510,443.98 = 206,542.10 : x
2. Step 2: Convert to fraction form
   369,886.40/510,443.98 = 206,542.10/x
3. Step 3: Cross multiply
   369,886.40x = 510,443.98 × 206,542.10
4. Step 4: Simplify right side
   369,886.40x = 105,428,172,321.31
5. Step 5: Solve for x
   x = 105,428,172,321.31/369,886.40
6. Step 6: Final answer
   x = 285,028.52