Finding the Fourth Proportional to 1,347.86, 1,858.89 and 928.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.86 : 1,858.89 = 928.89 : x
2. Step 2: Convert to fraction form
   1,347.86/1,858.89 = 928.89/x
3. Step 3: Cross multiply
   1,347.86x = 1,858.89 × 928.89
4. Step 4: Simplify right side
   1,347.86x = 1,726,704.33
5. Step 5: Solve for x
   x = 1,726,704.33/1,347.86
6. Step 6: Final answer
   x = 1,281.07