Finding the Fourth Proportional to 2,545.12, 3,815.40 and 901.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,545.12 : 3,815.40 = 901.45 : x
2. Step 2: Convert to fraction form
   2,545.12/3,815.40 = 901.45/x
3. Step 3: Cross multiply
   2,545.12x = 3,815.40 × 901.45
4. Step 4: Simplify right side
   2,545.12x = 3,439,411.21
5. Step 5: Solve for x
   x = 3,439,411.21/2,545.12
6. Step 6: Final answer
   x = 1,351.37