Finding the Fourth Proportional to 1,867.58, 2,801.69 and 771.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,867.58 : 2,801.69 = 771.35 : x
2. Step 2: Convert to fraction form
   1,867.58/2,801.69 = 771.35/x
3. Step 3: Cross multiply
   1,867.58x = 2,801.69 × 771.35
4. Step 4: Simplify right side
   1,867.58x = 2,161,065.72
5. Step 5: Solve for x
   x = 2,161,065.72/1,867.58
6. Step 6: Final answer
   x = 1,157.15