Finding the Fourth Proportional to 1,348.63, 1,861.05 and 789.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.63 : 1,861.05 = 789.10 : x
2. Step 2: Convert to fraction form
   1,348.63/1,861.05 = 789.10/x
3. Step 3: Cross multiply
   1,348.63x = 1,861.05 × 789.10
4. Step 4: Simplify right side
   1,348.63x = 1,468,554.56
5. Step 5: Solve for x
   x = 1,468,554.56/1,348.63
6. Step 6: Final answer
   x = 1,088.92