Finding the Fourth Proportional to 91,959.76, 138,056.40 and 78,196.24

Step by Step Solution

1. Step 1: Write the proportion equation
   91,959.76 : 138,056.40 = 78,196.24 : x
2. Step 2: Convert to fraction form
   91,959.76/138,056.40 = 78,196.24/x
3. Step 3: Cross multiply
   91,959.76x = 138,056.40 × 78,196.24
4. Step 4: Simplify right side
   91,959.76x = 10,795,491,387.94
5. Step 5: Solve for x
   x = 10,795,491,387.94/91,959.76
6. Step 6: Final answer
   x = 117,393.64