Finding the Fourth Proportional to 2,119.50, 2,925.72 and 1,421.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,119.50 : 2,925.72 = 1,421.28 : x
2. Step 2: Convert to fraction form
   2,119.50/2,925.72 = 1,421.28/x
3. Step 3: Cross multiply
   2,119.50x = 2,925.72 × 1,421.28
4. Step 4: Simplify right side
   2,119.50x = 4,158,267.32
5. Step 5: Solve for x
   x = 4,158,267.32/2,119.50
6. Step 6: Final answer
   x = 1,961.91