Finding the Fourth Proportional to 1,451.29, 2,002.80 and 788.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.29 : 2,002.80 = 788.17 : x
2. Step 2: Convert to fraction form
   1,451.29/2,002.80 = 788.17/x
3. Step 3: Cross multiply
   1,451.29x = 2,002.80 × 788.17
4. Step 4: Simplify right side
   1,451.29x = 1,578,546.88
5. Step 5: Solve for x
   x = 1,578,546.88/1,451.29
6. Step 6: Final answer
   x = 1,087.69