Finding the Fourth Proportional to 2,543.79, 3,818.09 and 1,312.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.79 : 3,818.09 = 1,312.05 : x
2. Step 2: Convert to fraction form
   2,543.79/3,818.09 = 1,312.05/x
3. Step 3: Cross multiply
   2,543.79x = 3,818.09 × 1,312.05
4. Step 4: Simplify right side
   2,543.79x = 5,009,524.98
5. Step 5: Solve for x
   x = 5,009,524.98/2,543.79
6. Step 6: Final answer
   x = 1,969.32