Finding the Fourth Proportional to 1,645.89, 2,271.15 and 947.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.89 : 2,271.15 = 947.13 : x
2. Step 2: Convert to fraction form
   1,645.89/2,271.15 = 947.13/x
3. Step 3: Cross multiply
   1,645.89x = 2,271.15 × 947.13
4. Step 4: Simplify right side
   1,645.89x = 2,151,074.30
5. Step 5: Solve for x
   x = 2,151,074.30/1,645.89
6. Step 6: Final answer
   x = 1,306.94