Finding the Fourth Proportional to 1,345.47, 1,857.57 and 1,066.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.47 : 1,857.57 = 1,066.83 : x
2. Step 2: Convert to fraction form
   1,345.47/1,857.57 = 1,066.83/x
3. Step 3: Cross multiply
   1,345.47x = 1,857.57 × 1,066.83
4. Step 4: Simplify right side
   1,345.47x = 1,981,702.12
5. Step 5: Solve for x
   x = 1,981,702.12/1,345.47
6. Step 6: Final answer
   x = 1,472.88