Finding the Fourth Proportional to 1,618.42, 2,428.05 and 578.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.42 : 2,428.05 = 578.38 : x
2. Step 2: Convert to fraction form
   1,618.42/2,428.05 = 578.38/x
3. Step 3: Cross multiply
   1,618.42x = 2,428.05 × 578.38
4. Step 4: Simplify right side
   1,618.42x = 1,404,335.56
5. Step 5: Solve for x
   x = 1,404,335.56/1,618.42
6. Step 6: Final answer
   x = 867.72