Finding the Fourth Proportional to 389,890.50, 538,050.52 and 211,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,890.50 : 538,050.52 = 211,042.50 : x
2. Step 2: Convert to fraction form
   389,890.50/538,050.52 = 211,042.50/x
3. Step 3: Cross multiply
   389,890.50x = 538,050.52 × 211,042.50
4. Step 4: Simplify right side
   389,890.50x = 113,551,526,867.10
5. Step 5: Solve for x
   x = 113,551,526,867.10/389,890.50
6. Step 6: Final answer
   x = 291,239.53