Finding the Fourth Proportional to 1,665.47, 2,495.98 and 788.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.47 : 2,495.98 = 788.21 : x
2. Step 2: Convert to fraction form
   1,665.47/2,495.98 = 788.21/x
3. Step 3: Cross multiply
   1,665.47x = 2,495.98 × 788.21
4. Step 4: Simplify right side
   1,665.47x = 1,967,356.40
5. Step 5: Solve for x
   x = 1,967,356.40/1,665.47
6. Step 6: Final answer
   x = 1,181.26