Finding the Fourth Proportional to 2,109.42, 3,164.72 and 876.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.42 : 3,164.72 = 876.60 : x
2. Step 2: Convert to fraction form
   2,109.42/3,164.72 = 876.60/x
3. Step 3: Cross multiply
   2,109.42x = 3,164.72 × 876.60
4. Step 4: Simplify right side
   2,109.42x = 2,774,193.55
5. Step 5: Solve for x
   x = 2,774,193.55/2,109.42
6. Step 6: Final answer
   x = 1,315.15