Finding the Fourth Proportional to 1,345.60, 1,857 and 1,013.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.60 : 1,857 = 1,013.42 : x
2. Step 2: Convert to fraction form
   1,345.60/1,857 = 1,013.42/x
3. Step 3: Cross multiply
   1,345.60x = 1,857 × 1,013.42
4. Step 4: Simplify right side
   1,345.60x = 1,881,920.94
5. Step 5: Solve for x
   x = 1,881,920.94/1,345.60
6. Step 6: Final answer
   x = 1,398.57