Finding the Fourth Proportional to 1,345.57, 1,857.53 and 903.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.57 : 1,857.53 = 903.79 : x
2. Step 2: Convert to fraction form
   1,345.57/1,857.53 = 903.79/x
3. Step 3: Cross multiply
   1,345.57x = 1,857.53 × 903.79
4. Step 4: Simplify right side
   1,345.57x = 1,678,817.04
5. Step 5: Solve for x
   x = 1,678,817.04/1,345.57
6. Step 6: Final answer
   x = 1,247.66