Finding the Fourth Proportional to 1,610.72, 2,222.76 and 947.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.72 : 2,222.76 = 947.96 : x
2. Step 2: Convert to fraction form
   1,610.72/2,222.76 = 947.96/x
3. Step 3: Cross multiply
   1,610.72x = 2,222.76 × 947.96
4. Step 4: Simplify right side
   1,610.72x = 2,107,087.57
5. Step 5: Solve for x
   x = 2,107,087.57/1,610.72
6. Step 6: Final answer
   x = 1,308.17