Finding the Fourth Proportional to 1,385.58, 1,910.24 and 942.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.58 : 1,910.24 = 942.71 : x
2. Step 2: Convert to fraction form
   1,385.58/1,910.24 = 942.71/x
3. Step 3: Cross multiply
   1,385.58x = 1,910.24 × 942.71
4. Step 4: Simplify right side
   1,385.58x = 1,800,788.09
5. Step 5: Solve for x
   x = 1,800,788.09/1,385.58
6. Step 6: Final answer
   x = 1,299.66