Finding the Fourth Proportional to 1,618.08, 2,421.72 and 1,422.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.08 : 2,421.72 = 1,422.96 : x
2. Step 2: Convert to fraction form
   1,618.08/2,421.72 = 1,422.96/x
3. Step 3: Cross multiply
   1,618.08x = 2,421.72 × 1,422.96
4. Step 4: Simplify right side
   1,618.08x = 3,446,010.69
5. Step 5: Solve for x
   x = 3,446,010.69/1,618.08
6. Step 6: Final answer
   x = 2,129.69