Finding the Fourth Proportional to 378,196.72, 521,908.88 and 208,430.96

Step by Step Solution

1. Step 1: Write the proportion equation
   378,196.72 : 521,908.88 = 208,430.96 : x
2. Step 2: Convert to fraction form
   378,196.72/521,908.88 = 208,430.96/x
3. Step 3: Cross multiply
   378,196.72x = 521,908.88 × 208,430.96
4. Step 4: Simplify right side
   378,196.72x = 108,781,968,890.93
5. Step 5: Solve for x
   x = 108,781,968,890.93/378,196.72
6. Step 6: Final answer
   x = 287,633.30