Finding the Fourth Proportional to 477,978.09, 659,618.20 and 260,193.05

Step by Step Solution

1. Step 1: Write the proportion equation
   477,978.09 : 659,618.20 = 260,193.05 : x
2. Step 2: Convert to fraction form
   477,978.09/659,618.20 = 260,193.05/x
3. Step 3: Cross multiply
   477,978.09x = 659,618.20 × 260,193.05
4. Step 4: Simplify right side
   477,978.09x = 171,628,071,293.51
5. Step 5: Solve for x
   x = 171,628,071,293.51/477,978.09
6. Step 6: Final answer
   x = 359,071.00