Finding the Fourth Proportional to 1,609.86, 2,221.71 and 901.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.86 : 2,221.71 = 901.76 : x
2. Step 2: Convert to fraction form
   1,609.86/2,221.71 = 901.76/x
3. Step 3: Cross multiply
   1,609.86x = 2,221.71 × 901.76
4. Step 4: Simplify right side
   1,609.86x = 2,003,438.10
5. Step 5: Solve for x
   x = 2,003,438.10/1,609.86
6. Step 6: Final answer
   x = 1,244.48