Finding the Fourth Proportional to 388,083.72, 535,554.72 and 218,317.96

Step by Step Solution

1. Step 1: Write the proportion equation
   388,083.72 : 535,554.72 = 218,317.96 : x
2. Step 2: Convert to fraction form
   388,083.72/535,554.72 = 218,317.96/x
3. Step 3: Cross multiply
   388,083.72x = 535,554.72 × 218,317.96
4. Step 4: Simplify right side
   388,083.72x = 116,921,213,938.77
5. Step 5: Solve for x
   x = 116,921,213,938.77/388,083.72
6. Step 6: Final answer
   x = 301,278.33