Finding the Fourth Proportional to 2,087.33, 3,130.72 and 788.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.33 : 3,130.72 = 788.63 : x
2. Step 2: Convert to fraction form
   2,087.33/3,130.72 = 788.63/x
3. Step 3: Cross multiply
   2,087.33x = 3,130.72 × 788.63
4. Step 4: Simplify right side
   2,087.33x = 2,468,962.09
5. Step 5: Solve for x
   x = 2,468,962.09/2,087.33
6. Step 6: Final answer
   x = 1,182.84