Finding the Fourth Proportional to 1,907.72, 2,633.46 and 1,287.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,907.72 : 2,633.46 = 1,287.56 : x
2. Step 2: Convert to fraction form
   1,907.72/2,633.46 = 1,287.56/x
3. Step 3: Cross multiply
   1,907.72x = 2,633.46 × 1,287.56
4. Step 4: Simplify right side
   1,907.72x = 3,390,737.76
5. Step 5: Solve for x
   x = 3,390,737.76/1,907.72
6. Step 6: Final answer
   x = 1,777.38