Finding the Fourth Proportional to 1,230.69, 1,697.88 and 788.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,230.69 : 1,697.88 = 788.52 : x
2. Step 2: Convert to fraction form
   1,230.69/1,697.88 = 788.52/x
3. Step 3: Cross multiply
   1,230.69x = 1,697.88 × 788.52
4. Step 4: Simplify right side
   1,230.69x = 1,338,812.34
5. Step 5: Solve for x
   x = 1,338,812.34/1,230.69
6. Step 6: Final answer
   x = 1,087.86