Finding the Fourth Proportional to 1,915.81, 2,643.83 and 1,087.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.81 : 2,643.83 = 1,087.81 : x
2. Step 2: Convert to fraction form
   1,915.81/2,643.83 = 1,087.81/x
3. Step 3: Cross multiply
   1,915.81x = 2,643.83 × 1,087.81
4. Step 4: Simplify right side
   1,915.81x = 2,875,984.71
5. Step 5: Solve for x
   x = 2,875,984.71/1,915.81
6. Step 6: Final answer
   x = 1,501.18