Finding the Fourth Proportional to 2,128.70, 3,188.90 and 1,201.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.70 : 3,188.90 = 1,201.46 : x
2. Step 2: Convert to fraction form
   2,128.70/3,188.90 = 1,201.46/x
3. Step 3: Cross multiply
   2,128.70x = 3,188.90 × 1,201.46
4. Step 4: Simplify right side
   2,128.70x = 3,831,328.34
5. Step 5: Solve for x
   x = 3,831,328.34/2,128.70
6. Step 6: Final answer
   x = 1,799.84