Finding the Fourth Proportional to 101,851.42, 140,550.80 and 56,531.31

Step by Step Solution

1. Step 1: Write the proportion equation
   101,851.42 : 140,550.80 = 56,531.31 : x
2. Step 2: Convert to fraction form
   101,851.42/140,550.80 = 56,531.31/x
3. Step 3: Cross multiply
   101,851.42x = 140,550.80 × 56,531.31
4. Step 4: Simplify right side
   101,851.42x = 7,945,521,089.96
5. Step 5: Solve for x
   x = 7,945,521,089.96/101,851.42
6. Step 6: Final answer
   x = 78,010.90