Finding the Fourth Proportional to 10,856.21, 16,258.80 and 5,292.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,856.21 : 16,258.80 = 5,292.12 : x
2. Step 2: Convert to fraction form
   10,856.21/16,258.80 = 5,292.12/x
3. Step 3: Cross multiply
   10,856.21x = 16,258.80 × 5,292.12
4. Step 4: Simplify right side
   10,856.21x = 86,043,520.66
5. Step 5: Solve for x
   x = 86,043,520.66/10,856.21
6. Step 6: Final answer
   x = 7,925.75