Finding the Fourth Proportional to 1,087.71, 1,618.48 and 1,084.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.71 : 1,618.48 = 1,084.07 : x
2. Step 2: Convert to fraction form
   1,087.71/1,618.48 = 1,084.07/x
3. Step 3: Cross multiply
   1,087.71x = 1,618.48 × 1,084.07
4. Step 4: Simplify right side
   1,087.71x = 1,754,541.91
5. Step 5: Solve for x
   x = 1,754,541.91/1,087.71
6. Step 6: Final answer
   x = 1,613.06