Finding the Fourth Proportional to 388,436.52, 536,052.42 and 218,676.72

Step by Step Solution

1. Step 1: Write the proportion equation
   388,436.52 : 536,052.42 = 218,676.72 : x
2. Step 2: Convert to fraction form
   388,436.52/536,052.42 = 218,676.72/x
3. Step 3: Cross multiply
   388,436.52x = 536,052.42 × 218,676.72
4. Step 4: Simplify right side
   388,436.52x = 117,222,184,953.66
5. Step 5: Solve for x
   x = 117,222,184,953.66/388,436.52
6. Step 6: Final answer
   x = 301,779.52