Finding the Fourth Proportional to 1,051.88, 1,575.98 and 680.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.88 : 1,575.98 = 680.69 : x
2. Step 2: Convert to fraction form
   1,051.88/1,575.98 = 680.69/x
3. Step 3: Cross multiply
   1,051.88x = 1,575.98 × 680.69
4. Step 4: Simplify right side
   1,051.88x = 1,072,742.54
5. Step 5: Solve for x
   x = 1,072,742.54/1,051.88
6. Step 6: Final answer
   x = 1,019.84