Finding the Fourth Proportional to 1,343.85, 2,012.18 and 788.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.85 : 2,012.18 = 788.10 : x
2. Step 2: Convert to fraction form
   1,343.85/2,012.18 = 788.10/x
3. Step 3: Cross multiply
   1,343.85x = 2,012.18 × 788.10
4. Step 4: Simplify right side
   1,343.85x = 1,585,807.87
5. Step 5: Solve for x
   x = 1,585,807.87/1,343.85
6. Step 6: Final answer
   x = 1,180.05