Finding the Fourth Proportional to 1,018.89, 1,528.56 and 316.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.89 : 1,528.56 = 316.17 : x
2. Step 2: Convert to fraction form
   1,018.89/1,528.56 = 316.17/x
3. Step 3: Cross multiply
   1,018.89x = 1,528.56 × 316.17
4. Step 4: Simplify right side
   1,018.89x = 483,284.82
5. Step 5: Solve for x
   x = 483,284.82/1,018.89
6. Step 6: Final answer
   x = 474.32