Finding the Fourth Proportional to 93,419.60, 128,879.73 and 65,141.69

Step by Step Solution

1. Step 1: Write the proportion equation
   93,419.60 : 128,879.73 = 65,141.69 : x
2. Step 2: Convert to fraction form
   93,419.60/128,879.73 = 65,141.69/x
3. Step 3: Cross multiply
   93,419.60x = 128,879.73 × 65,141.69
4. Step 4: Simplify right side
   93,419.60x = 8,395,442,774.55
5. Step 5: Solve for x
   x = 8,395,442,774.55/93,419.60
6. Step 6: Final answer
   x = 89,868.11