Finding the Fourth Proportional to 101,742.72, 140,399.16 and 56,418

Step by Step Solution

1. Step 1: Write the proportion equation
   101,742.72 : 140,399.16 = 56,418 : x
2. Step 2: Convert to fraction form
   101,742.72/140,399.16 = 56,418/x
3. Step 3: Cross multiply
   101,742.72x = 140,399.16 × 56,418
4. Step 4: Simplify right side
   101,742.72x = 7,921,039,808.88
5. Step 5: Solve for x
   x = 7,921,039,808.88/101,742.72
6. Step 6: Final answer
   x = 77,853.63