Finding the Fourth Proportional to 101,462.72, 140,022.68 and 56,139.96

Step by Step Solution

1. Step 1: Write the proportion equation
   101,462.72 : 140,022.68 = 56,139.96 : x
2. Step 2: Convert to fraction form
   101,462.72/140,022.68 = 56,139.96/x
3. Step 3: Cross multiply
   101,462.72x = 140,022.68 × 56,139.96
4. Step 4: Simplify right side
   101,462.72x = 7,860,867,654.29
5. Step 5: Solve for x
   x = 7,860,867,654.29/101,462.72
6. Step 6: Final answer
   x = 77,475.43