Finding the Fourth Proportional to 2,602.72, 3,904.89 and 872.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.72 : 3,904.89 = 872.56 : x
2. Step 2: Convert to fraction form
   2,602.72/3,904.89 = 872.56/x
3. Step 3: Cross multiply
   2,602.72x = 3,904.89 × 872.56
4. Step 4: Simplify right side
   2,602.72x = 3,407,250.82
5. Step 5: Solve for x
   x = 3,407,250.82/2,602.72
6. Step 6: Final answer
   x = 1,309.11