Finding the Fourth Proportional to 257,665.22, 386,499.89 and 105,823.18

Step by Step Solution

1. Step 1: Write the proportion equation
   257,665.22 : 386,499.89 = 105,823.18 : x
2. Step 2: Convert to fraction form
   257,665.22/386,499.89 = 105,823.18/x
3. Step 3: Cross multiply
   257,665.22x = 386,499.89 × 105,823.18
4. Step 4: Simplify right side
   257,665.22x = 40,900,646,727.76
5. Step 5: Solve for x
   x = 40,900,646,727.76/257,665.22
6. Step 6: Final answer
   x = 158,735.61