Finding the Fourth Proportional to 101,711.42, 140,357.89 and 56,390.10

Step by Step Solution

1. Step 1: Write the proportion equation
   101,711.42 : 140,357.89 = 56,390.10 : x
2. Step 2: Convert to fraction form
   101,711.42/140,357.89 = 56,390.10/x
3. Step 3: Cross multiply
   101,711.42x = 140,357.89 × 56,390.10
4. Step 4: Simplify right side
   101,711.42x = 7,914,795,452.89
5. Step 5: Solve for x
   x = 7,914,795,452.89/101,711.42
6. Step 6: Final answer
   x = 77,816.19