Finding the Fourth Proportional to 2,101.58, 3,148.27 and 1,221.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.58 : 3,148.27 = 1,221.92 : x
2. Step 2: Convert to fraction form
   2,101.58/3,148.27 = 1,221.92/x
3. Step 3: Cross multiply
   2,101.58x = 3,148.27 × 1,221.92
4. Step 4: Simplify right side
   2,101.58x = 3,846,915.28
5. Step 5: Solve for x
   x = 3,846,915.28/2,101.58
6. Step 6: Final answer
   x = 1,830.49