Finding the Fourth Proportional to 380,109.38, 524,555.61 and 210,359.30

Step by Step Solution

1. Step 1: Write the proportion equation
   380,109.38 : 524,555.61 = 210,359.30 : x
2. Step 2: Convert to fraction form
   380,109.38/524,555.61 = 210,359.30/x
3. Step 3: Cross multiply
   380,109.38x = 524,555.61 × 210,359.30
4. Step 4: Simplify right side
   380,109.38x = 110,345,150,930.67
5. Step 5: Solve for x
   x = 110,345,150,930.67/380,109.38
6. Step 6: Final answer
   x = 290,298.42