Finding the Fourth Proportional to 2,123.21, 2,930.18 and 1,284.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.21 : 2,930.18 = 1,284.05 : x
2. Step 2: Convert to fraction form
   2,123.21/2,930.18 = 1,284.05/x
3. Step 3: Cross multiply
   2,123.21x = 2,930.18 × 1,284.05
4. Step 4: Simplify right side
   2,123.21x = 3,762,498.53
5. Step 5: Solve for x
   x = 3,762,498.53/2,123.21
6. Step 6: Final answer
   x = 1,772.08