Finding the Fourth Proportional to 1,618.78, 2,428.56 and 464.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.78 : 2,428.56 = 464.50 : x
2. Step 2: Convert to fraction form
   1,618.78/2,428.56 = 464.50/x
3. Step 3: Cross multiply
   1,618.78x = 2,428.56 × 464.50
4. Step 4: Simplify right side
   1,618.78x = 1,128,066.12
5. Step 5: Solve for x
   x = 1,128,066.12/1,618.78
6. Step 6: Final answer
   x = 696.86