Finding the Fourth Proportional to 79,498.40, 109,718.16 and 51,286.12

Step by Step Solution

1. Step 1: Write the proportion equation
   79,498.40 : 109,718.16 = 51,286.12 : x
2. Step 2: Convert to fraction form
   79,498.40/109,718.16 = 51,286.12/x
3. Step 3: Cross multiply
   79,498.40x = 109,718.16 × 51,286.12
4. Step 4: Simplify right side
   79,498.40x = 5,627,018,719.94
5. Step 5: Solve for x
   x = 5,627,018,719.94/79,498.40
6. Step 6: Final answer
   x = 70,781.53