Finding the Fourth Proportional to 278,974.10, 418,477.35 and 79,309.10

Step by Step Solution

1. Step 1: Write the proportion equation
   278,974.10 : 418,477.35 = 79,309.10 : x
2. Step 2: Convert to fraction form
   278,974.10/418,477.35 = 79,309.10/x
3. Step 3: Cross multiply
   278,974.10x = 418,477.35 × 79,309.10
4. Step 4: Simplify right side
   278,974.10x = 33,189,061,998.89
5. Step 5: Solve for x
   x = 33,189,061,998.89/278,974.10
6. Step 6: Final answer
   x = 118,968.26