Finding the Fourth Proportional to 1,489.86, 2,056.43 and 900.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,489.86 : 2,056.43 = 900.43 : x
2. Step 2: Convert to fraction form
   1,489.86/2,056.43 = 900.43/x
3. Step 3: Cross multiply
   1,489.86x = 2,056.43 × 900.43
4. Step 4: Simplify right side
   1,489.86x = 1,851,668.37
5. Step 5: Solve for x
   x = 1,851,668.37/1,489.86
6. Step 6: Final answer
   x = 1,242.85