Finding the Fourth Proportional to 1,345.80, 1,857.24 and 756.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.80 : 1,857.24 = 756.30 : x
2. Step 2: Convert to fraction form
   1,345.80/1,857.24 = 756.30/x
3. Step 3: Cross multiply
   1,345.80x = 1,857.24 × 756.30
4. Step 4: Simplify right side
   1,345.80x = 1,404,630.61
5. Step 5: Solve for x
   x = 1,404,630.61/1,345.80
6. Step 6: Final answer
   x = 1,043.71