Finding the Fourth Proportional to 1,665.87, 2,499.12 and 788.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.87 : 2,499.12 = 788.37 : x
2. Step 2: Convert to fraction form
   1,665.87/2,499.12 = 788.37/x
3. Step 3: Cross multiply
   1,665.87x = 2,499.12 × 788.37
4. Step 4: Simplify right side
   1,665.87x = 1,970,231.23
5. Step 5: Solve for x
   x = 1,970,231.23/1,665.87
6. Step 6: Final answer
   x = 1,182.70