Finding the Fourth Proportional to 12,892.31, 17,786.08 and 7,854.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,892.31 : 17,786.08 = 7,854.70 : x
2. Step 2: Convert to fraction form
   12,892.31/17,786.08 = 7,854.70/x
3. Step 3: Cross multiply
   12,892.31x = 17,786.08 × 7,854.70
4. Step 4: Simplify right side
   12,892.31x = 139,704,322.58
5. Step 5: Solve for x
   x = 139,704,322.58/12,892.31
6. Step 6: Final answer
   x = 10,836.25