Finding the Fourth Proportional to 363,131.58, 501,086.40 and 210,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   363,131.58 : 501,086.40 = 210,139.38 : x
2. Step 2: Convert to fraction form
   363,131.58/501,086.40 = 210,139.38/x
3. Step 3: Cross multiply
   363,131.58x = 501,086.40 × 210,139.38
4. Step 4: Simplify right side
   363,131.58x = 105,297,985,422.43
5. Step 5: Solve for x
   x = 105,297,985,422.43/363,131.58
6. Step 6: Final answer
   x = 289,971.99