Finding the Fourth Proportional to 1,915.34, 2,870.24 and 1,091.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.34 : 2,870.24 = 1,091.88 : x
2. Step 2: Convert to fraction form
   1,915.34/2,870.24 = 1,091.88/x
3. Step 3: Cross multiply
   1,915.34x = 2,870.24 × 1,091.88
4. Step 4: Simplify right side
   1,915.34x = 3,133,957.65
5. Step 5: Solve for x
   x = 3,133,957.65/1,915.34
6. Step 6: Final answer
   x = 1,636.24