Finding the Fourth Proportional to 101,333.72, 139,840.26 and 56,621.72

Step by Step Solution

1. Step 1: Write the proportion equation
   101,333.72 : 139,840.26 = 56,621.72 : x
2. Step 2: Convert to fraction form
   101,333.72/139,840.26 = 56,621.72/x
3. Step 3: Cross multiply
   101,333.72x = 139,840.26 × 56,621.72
4. Step 4: Simplify right side
   101,333.72x = 7,917,996,046.45
5. Step 5: Solve for x
   x = 7,917,996,046.45/101,333.72
6. Step 6: Final answer
   x = 78,137.82