Finding the Fourth Proportional to 2,656.15, 3,981.47 and 900.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.15 : 3,981.47 = 900.57 : x
2. Step 2: Convert to fraction form
   2,656.15/3,981.47 = 900.57/x
3. Step 3: Cross multiply
   2,656.15x = 3,981.47 × 900.57
4. Step 4: Simplify right side
   2,656.15x = 3,585,592.44
5. Step 5: Solve for x
   x = 3,585,592.44/2,656.15
6. Step 6: Final answer
   x = 1,349.92