Finding the Fourth Proportional to 1,451.42, 2,002.98 and 788.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.42 : 2,002.98 = 788.30 : x
2. Step 2: Convert to fraction form
   1,451.42/2,002.98 = 788.30/x
3. Step 3: Cross multiply
   1,451.42x = 2,002.98 × 788.30
4. Step 4: Simplify right side
   1,451.42x = 1,578,949.13
5. Step 5: Solve for x
   x = 1,578,949.13/1,451.42
6. Step 6: Final answer
   x = 1,087.87