Finding the Fourth Proportional to 1,275.42, 1,907.94 and 1,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.42 : 1,907.94 = 1,099.50 : x
2. Step 2: Convert to fraction form
   1,275.42/1,907.94 = 1,099.50/x
3. Step 3: Cross multiply
   1,275.42x = 1,907.94 × 1,099.50
4. Step 4: Simplify right side
   1,275.42x = 2,097,780.03
5. Step 5: Solve for x
   x = 2,097,780.03/1,275.42
6. Step 6: Final answer
   x = 1,644.78