Finding the Fourth Proportional to 104,738.30, 144,540.59 and 56,991.89

Step by Step Solution

1. Step 1: Write the proportion equation
   104,738.30 : 144,540.59 = 56,991.89 : x
2. Step 2: Convert to fraction form
   104,738.30/144,540.59 = 56,991.89/x
3. Step 3: Cross multiply
   104,738.30x = 144,540.59 × 56,991.89
4. Step 4: Simplify right side
   104,738.30x = 8,237,640,398.15
5. Step 5: Solve for x
   x = 8,237,640,398.15/104,738.30
6. Step 6: Final answer
   x = 78,649.75