Finding the Fourth Proportional to 12,854.33, 17,740.28 and 7,818.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,854.33 : 17,740.28 = 7,818.90 : x
2. Step 2: Convert to fraction form
   12,854.33/17,740.28 = 7,818.90/x
3. Step 3: Cross multiply
   12,854.33x = 17,740.28 × 7,818.90
4. Step 4: Simplify right side
   12,854.33x = 138,709,428.31
5. Step 5: Solve for x
   x = 138,709,428.31/12,854.33
6. Step 6: Final answer
   x = 10,790.87