Finding the Fourth Proportional to 204,084.77, 305,618.00 and 128,978.33

Step by Step Solution

1. Step 1: Write the proportion equation
   204,084.77 : 305,618.00 = 128,978.33 : x
2. Step 2: Convert to fraction form
   204,084.77/305,618.00 = 128,978.33/x
3. Step 3: Cross multiply
   204,084.77x = 305,618.00 × 128,978.33
4. Step 4: Simplify right side
   204,084.77x = 39,418,097,084.96
5. Step 5: Solve for x
   x = 39,418,097,084.96/204,084.77
6. Step 6: Final answer
   x = 193,145.71