Finding the Fourth Proportional to 104,724.42, 144,520.30 and 56,978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   104,724.42 : 144,520.30 = 56,978.09 : x
2. Step 2: Convert to fraction form
   104,724.42/144,520.30 = 56,978.09/x
3. Step 3: Cross multiply
   104,724.42x = 144,520.30 × 56,978.09
4. Step 4: Simplify right side
   104,724.42x = 8,234,490,660.23
5. Step 5: Solve for x
   x = 8,234,490,660.23/104,724.42
6. Step 6: Final answer
   x = 78,630.09