Finding the Fourth Proportional to 1,406.55, 2,107.13 and 788.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.55 : 2,107.13 = 788.38 : x
2. Step 2: Convert to fraction form
   1,406.55/2,107.13 = 788.38/x
3. Step 3: Cross multiply
   1,406.55x = 2,107.13 × 788.38
4. Step 4: Simplify right side
   1,406.55x = 1,661,219.15
5. Step 5: Solve for x
   x = 1,661,219.15/1,406.55
6. Step 6: Final answer
   x = 1,181.06