Finding the Fourth Proportional to 1,385.33, 1,911.89 and 1,342.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.33 : 1,911.89 = 1,342.31 : x
2. Step 2: Convert to fraction form
   1,385.33/1,911.89 = 1,342.31/x
3. Step 3: Cross multiply
   1,385.33x = 1,911.89 × 1,342.31
4. Step 4: Simplify right side
   1,385.33x = 2,566,342.86
5. Step 5: Solve for x
   x = 2,566,342.86/1,385.33
6. Step 6: Final answer
   x = 1,852.52