Finding the Fourth Proportional to 309,915.73, 427,714.46 and 189,137.98

Step by Step Solution

1. Step 1: Write the proportion equation
   309,915.73 : 427,714.46 = 189,137.98 : x
2. Step 2: Convert to fraction form
   309,915.73/427,714.46 = 189,137.98/x
3. Step 3: Cross multiply
   309,915.73x = 427,714.46 × 189,137.98
4. Step 4: Simplify right side
   309,915.73x = 80,897,048,981.19
5. Step 5: Solve for x
   x = 80,897,048,981.19/309,915.73
6. Step 6: Final answer
   x = 261,029.18