Finding the Fourth Proportional to 1,620.42, 2,225.42 and 1,357.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.42 : 2,225.42 = 1,357.98 : x
2. Step 2: Convert to fraction form
   1,620.42/2,225.42 = 1,357.98/x
3. Step 3: Cross multiply
   1,620.42x = 2,225.42 × 1,357.98
4. Step 4: Simplify right side
   1,620.42x = 3,022,069.06
5. Step 5: Solve for x
   x = 3,022,069.06/1,620.42
6. Step 6: Final answer
   x = 1,864.99