Finding the Fourth Proportional to 1,645.50, 2,270.88 and 947.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.50 : 2,270.88 = 947.10 : x
2. Step 2: Convert to fraction form
   1,645.50/2,270.88 = 947.10/x
3. Step 3: Cross multiply
   1,645.50x = 2,270.88 × 947.10
4. Step 4: Simplify right side
   1,645.50x = 2,150,750.45
5. Step 5: Solve for x
   x = 2,150,750.45/1,645.50
6. Step 6: Final answer
   x = 1,307.05