Finding the Fourth Proportional to 101,721.48, 140,355.72 and 56,397.48

Step by Step Solution

1. Step 1: Write the proportion equation
   101,721.48 : 140,355.72 = 56,397.48 : x
2. Step 2: Convert to fraction form
   101,721.48/140,355.72 = 56,397.48/x
3. Step 3: Cross multiply
   101,721.48x = 140,355.72 × 56,397.48
4. Step 4: Simplify right side
   101,721.48x = 7,915,708,911.59
5. Step 5: Solve for x
   x = 7,915,708,911.59/101,721.48
6. Step 6: Final answer
   x = 77,817.48