Finding the Fourth Proportional to 123,803.78, 170,846.42 and 72,806.58

Step by Step Solution

1. Step 1: Write the proportion equation
   123,803.78 : 170,846.42 = 72,806.58 : x
2. Step 2: Convert to fraction form
   123,803.78/170,846.42 = 72,806.58/x
3. Step 3: Cross multiply
   123,803.78x = 170,846.42 × 72,806.58
4. Step 4: Simplify right side
   123,803.78x = 12,438,743,181.41
5. Step 5: Solve for x
   x = 12,438,743,181.41/123,803.78
6. Step 6: Final answer
   x = 100,471.44