Finding the Fourth Proportional to 1,645.55, 2,257.89 and 1,630.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.55 : 2,257.89 = 1,630.07 : x
2. Step 2: Convert to fraction form
   1,645.55/2,257.89 = 1,630.07/x
3. Step 3: Cross multiply
   1,645.55x = 2,257.89 × 1,630.07
4. Step 4: Simplify right side
   1,645.55x = 3,680,507.46
5. Step 5: Solve for x
   x = 3,680,507.46/1,645.55
6. Step 6: Final answer
   x = 2,236.65