Finding the Fourth Proportional to 1,345.70, 1,856.97 and 756.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.70 : 1,856.97 = 756.15 : x
2. Step 2: Convert to fraction form
   1,345.70/1,856.97 = 756.15/x
3. Step 3: Cross multiply
   1,345.70x = 1,856.97 × 756.15
4. Step 4: Simplify right side
   1,345.70x = 1,404,147.87
5. Step 5: Solve for x
   x = 1,404,147.87/1,345.70
6. Step 6: Final answer
   x = 1,043.43