Finding the Fourth Proportional to 1,665.19, 2,495.69 and 787.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.19 : 2,495.69 = 787.69 : x
2. Step 2: Convert to fraction form
   1,665.19/2,495.69 = 787.69/x
3. Step 3: Cross multiply
   1,665.19x = 2,495.69 × 787.69
4. Step 4: Simplify right side
   1,665.19x = 1,965,813.64
5. Step 5: Solve for x
   x = 1,965,813.64/1,665.19
6. Step 6: Final answer
   x = 1,180.54