Finding the Fourth Proportional to 1,871.35, 2,808.29 and 775.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.35 : 2,808.29 = 775.72 : x
2. Step 2: Convert to fraction form
   1,871.35/2,808.29 = 775.72/x
3. Step 3: Cross multiply
   1,871.35x = 2,808.29 × 775.72
4. Step 4: Simplify right side
   1,871.35x = 2,178,435.82
5. Step 5: Solve for x
   x = 2,178,435.82/1,871.35
6. Step 6: Final answer
   x = 1,164.10