Finding the Fourth Proportional to 1,253.50, 1,881.98 and 789.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,253.50 : 1,881.98 = 789.91 : x
2. Step 2: Convert to fraction form
   1,253.50/1,881.98 = 789.91/x
3. Step 3: Cross multiply
   1,253.50x = 1,881.98 × 789.91
4. Step 4: Simplify right side
   1,253.50x = 1,486,594.82
5. Step 5: Solve for x
   x = 1,486,594.82/1,253.50
6. Step 6: Final answer
   x = 1,185.96