Finding the Fourth Proportional to 2,545.56, 3,818.79 and 1,312.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,545.56 : 3,818.79 = 1,312.63 : x
2. Step 2: Convert to fraction form
   2,545.56/3,818.79 = 1,312.63/x
3. Step 3: Cross multiply
   2,545.56x = 3,818.79 × 1,312.63
4. Step 4: Simplify right side
   2,545.56x = 5,012,648.77
5. Step 5: Solve for x
   x = 5,012,648.77/2,545.56
6. Step 6: Final answer
   x = 1,969.17