Finding the Fourth Proportional to 79,691.18, 109,936.89 and 51,405.98

Step by Step Solution

1. Step 1: Write the proportion equation
   79,691.18 : 109,936.89 = 51,405.98 : x
2. Step 2: Convert to fraction form
   79,691.18/109,936.89 = 51,405.98/x
3. Step 3: Cross multiply
   79,691.18x = 109,936.89 × 51,405.98
4. Step 4: Simplify right side
   79,691.18x = 5,651,413,568.60
5. Step 5: Solve for x
   x = 5,651,413,568.60/79,691.18
6. Step 6: Final answer
   x = 70,916.42