Finding the Fourth Proportional to 1,871.42, 2,805.76 and 898.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.42 : 2,805.76 = 898.21 : x
2. Step 2: Convert to fraction form
   1,871.42/2,805.76 = 898.21/x
3. Step 3: Cross multiply
   1,871.42x = 2,805.76 × 898.21
4. Step 4: Simplify right side
   1,871.42x = 2,520,161.69
5. Step 5: Solve for x
   x = 2,520,161.69/1,871.42
6. Step 6: Final answer
   x = 1,346.66