Finding the Fourth Proportional to 1,357.17, 1,872.84 and 767.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.17 : 1,872.84 = 767.72 : x
2. Step 2: Convert to fraction form
   1,357.17/1,872.84 = 767.72/x
3. Step 3: Cross multiply
   1,357.17x = 1,872.84 × 767.72
4. Step 4: Simplify right side
   1,357.17x = 1,437,816.72
5. Step 5: Solve for x
   x = 1,437,816.72/1,357.17
6. Step 6: Final answer
   x = 1,059.42