Finding the Fourth Proportional to 2,128.58, 3,188.72 and 1,201.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.58 : 3,188.72 = 1,201.33 : x
2. Step 2: Convert to fraction form
   2,128.58/3,188.72 = 1,201.33/x
3. Step 3: Cross multiply
   2,128.58x = 3,188.72 × 1,201.33
4. Step 4: Simplify right side
   2,128.58x = 3,830,705.23
5. Step 5: Solve for x
   x = 3,830,705.23/2,128.58
6. Step 6: Final answer
   x = 1,799.65