Finding the Fourth Proportional to 7,191.31, 10,786.90 and 1,854.47

Step by Step Solution

1. Step 1: Write the proportion equation
   7,191.31 : 10,786.90 = 1,854.47 : x
2. Step 2: Convert to fraction form
   7,191.31/10,786.90 = 1,854.47/x
3. Step 3: Cross multiply
   7,191.31x = 10,786.90 × 1,854.47
4. Step 4: Simplify right side
   7,191.31x = 20,003,928.51
5. Step 5: Solve for x
   x = 20,003,928.51/7,191.31
6. Step 6: Final answer
   x = 2,781.68