Finding the Fourth Proportional to 1,357.17, 1,872.91 and 767.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.17 : 1,872.91 = 767.83 : x
2. Step 2: Convert to fraction form
   1,357.17/1,872.91 = 767.83/x
3. Step 3: Cross multiply
   1,357.17x = 1,872.91 × 767.83
4. Step 4: Simplify right side
   1,357.17x = 1,438,071.96
5. Step 5: Solve for x
   x = 1,438,071.96/1,357.17
6. Step 6: Final answer
   x = 1,059.61