Finding the Fourth Proportional to 259,404.64, 389,118.89 and 79,477.18

Step by Step Solution

1. Step 1: Write the proportion equation
   259,404.64 : 389,118.89 = 79,477.18 : x
2. Step 2: Convert to fraction form
   259,404.64/389,118.89 = 79,477.18/x
3. Step 3: Cross multiply
   259,404.64x = 389,118.89 × 79,477.18
4. Step 4: Simplify right side
   259,404.64x = 30,926,071,664.54
5. Step 5: Solve for x
   x = 30,926,071,664.54/259,404.64
6. Step 6: Final answer
   x = 119,219.42