Finding the Fourth Proportional to 1,618.01, 2,428.83 and 644.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.01 : 2,428.83 = 644.79 : x
2. Step 2: Convert to fraction form
   1,618.01/2,428.83 = 644.79/x
3. Step 3: Cross multiply
   1,618.01x = 2,428.83 × 644.79
4. Step 4: Simplify right side
   1,618.01x = 1,566,085.30
5. Step 5: Solve for x
   x = 1,566,085.30/1,618.01
6. Step 6: Final answer
   x = 967.91