Finding the Fourth Proportional to 1,645.22, 2,270.91 and 947.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.22 : 2,270.91 = 947.06 : x
2. Step 2: Convert to fraction form
   1,645.22/2,270.91 = 947.06/x
3. Step 3: Cross multiply
   1,645.22x = 2,270.91 × 947.06
4. Step 4: Simplify right side
   1,645.22x = 2,150,688.02
5. Step 5: Solve for x
   x = 2,150,688.02/1,645.22
6. Step 6: Final answer
   x = 1,307.23