Finding the Fourth Proportional to 1,646.87, 2,272.72 and 900.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,646.87 : 2,272.72 = 900.86 : x
2. Step 2: Convert to fraction form
   1,646.87/2,272.72 = 900.86/x
3. Step 3: Cross multiply
   1,646.87x = 2,272.72 × 900.86
4. Step 4: Simplify right side
   1,646.87x = 2,047,402.54
5. Step 5: Solve for x
   x = 2,047,402.54/1,646.87
6. Step 6: Final answer
   x = 1,243.21