Finding the Fourth Proportional to 1,391.33, 1,919.96 and 761.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.33 : 1,919.96 = 761.86 : x
2. Step 2: Convert to fraction form
   1,391.33/1,919.96 = 761.86/x
3. Step 3: Cross multiply
   1,391.33x = 1,919.96 × 761.86
4. Step 4: Simplify right side
   1,391.33x = 1,462,740.73
5. Step 5: Solve for x
   x = 1,462,740.73/1,391.33
6. Step 6: Final answer
   x = 1,051.33