Finding the Fourth Proportional to 378,744.74, 522,667.38 and 208,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   378,744.74 : 522,667.38 = 208,978.88 : x
2. Step 2: Convert to fraction form
   378,744.74/522,667.38 = 208,978.88/x
3. Step 3: Cross multiply
   378,744.74x = 522,667.38 × 208,978.88
4. Step 4: Simplify right side
   378,744.74x = 109,226,443,684.93
5. Step 5: Solve for x
   x = 109,226,443,684.93/378,744.74
6. Step 6: Final answer
   x = 288,390.66