Finding the Fourth Proportional to 139,271.91, 192,096.86 and 85,587.13

Step by Step Solution

1. Step 1: Write the proportion equation
   139,271.91 : 192,096.86 = 85,587.13 : x
2. Step 2: Convert to fraction form
   139,271.91/192,096.86 = 85,587.13/x
3. Step 3: Cross multiply
   139,271.91x = 192,096.86 × 85,587.13
4. Step 4: Simplify right side
   139,271.91x = 16,441,018,929.41
5. Step 5: Solve for x
   x = 16,441,018,929.41/139,271.91
6. Step 6: Final answer
   x = 118,049.78