Finding the Fourth Proportional to 1,620.50, 2,231.38 and 1,358.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.50 : 2,231.38 = 1,358.06 : x
2. Step 2: Convert to fraction form
   1,620.50/2,231.38 = 1,358.06/x
3. Step 3: Cross multiply
   1,620.50x = 2,231.38 × 1,358.06
4. Step 4: Simplify right side
   1,620.50x = 3,030,333.37
5. Step 5: Solve for x
   x = 3,030,333.37/1,620.50
6. Step 6: Final answer
   x = 1,870.00