Finding the Fourth Proportional to 378,667.09, 522,524.28 and 208,890.28

Step by Step Solution

1. Step 1: Write the proportion equation
   378,667.09 : 522,524.28 = 208,890.28 : x
2. Step 2: Convert to fraction form
   378,667.09/522,524.28 = 208,890.28/x
3. Step 3: Cross multiply
   378,667.09x = 522,524.28 × 208,890.28
4. Step 4: Simplify right side
   378,667.09x = 109,150,243,156.00
5. Step 5: Solve for x
   x = 109,150,243,156.00/378,667.09
6. Step 6: Final answer
   x = 288,248.56