Finding the Fourth Proportional to 1,010.71, 1,516.59 and 418.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.71 : 1,516.59 = 418.17 : x
2. Step 2: Convert to fraction form
   1,010.71/1,516.59 = 418.17/x
3. Step 3: Cross multiply
   1,010.71x = 1,516.59 × 418.17
4. Step 4: Simplify right side
   1,010.71x = 634,196.31
5. Step 5: Solve for x
   x = 634,196.31/1,010.71
6. Step 6: Final answer
   x = 627.47