Finding the Fourth Proportional to 1,787.58, 2,467.01 and 991.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,787.58 : 2,467.01 = 991.10 : x
2. Step 2: Convert to fraction form
   1,787.58/2,467.01 = 991.10/x
3. Step 3: Cross multiply
   1,787.58x = 2,467.01 × 991.10
4. Step 4: Simplify right side
   1,787.58x = 2,445,036.32
5. Step 5: Solve for x
   x = 2,445,036.32/1,787.58
6. Step 6: Final answer
   x = 1,367.79