Finding the Fourth Proportional to 1,200.15, 1,798.61 and 788.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.15 : 1,798.61 = 788.67 : x
2. Step 2: Convert to fraction form
   1,200.15/1,798.61 = 788.67/x
3. Step 3: Cross multiply
   1,200.15x = 1,798.61 × 788.67
4. Step 4: Simplify right side
   1,200.15x = 1,418,505.81
5. Step 5: Solve for x
   x = 1,418,505.81/1,200.15
6. Step 6: Final answer
   x = 1,181.94