Finding the Fourth Proportional to 1,451.30, 2,002.79 and 788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.30 : 2,002.79 = 788.15 : x
2. Step 2: Convert to fraction form
   1,451.30/2,002.79 = 788.15/x
3. Step 3: Cross multiply
   1,451.30x = 2,002.79 × 788.15
4. Step 4: Simplify right side
   1,451.30x = 1,578,484.98
5. Step 5: Solve for x
   x = 1,578,484.98/1,451.30
6. Step 6: Final answer
   x = 1,087.64