Finding the Fourth Proportional to 104,725.28, 144,518.72 and 56,978.82

Step by Step Solution

1. Step 1: Write the proportion equation
   104,725.28 : 144,518.72 = 56,978.82 : x
2. Step 2: Convert to fraction form
   104,725.28/144,518.72 = 56,978.82/x
3. Step 3: Cross multiply
   104,725.28x = 144,518.72 × 56,978.82
4. Step 4: Simplify right side
   104,725.28x = 8,234,505,848.62
5. Step 5: Solve for x
   x = 8,234,505,848.62/104,725.28
6. Step 6: Final answer
   x = 78,629.59