Finding the Fourth Proportional to 140,910.71, 211,376.05 and 56,671.31

Step by Step Solution

1. Step 1: Write the proportion equation
   140,910.71 : 211,376.05 = 56,671.31 : x
2. Step 2: Convert to fraction form
   140,910.71/211,376.05 = 56,671.31/x
3. Step 3: Cross multiply
   140,910.71x = 211,376.05 × 56,671.31
4. Step 4: Simplify right side
   140,910.71x = 11,978,958,042.89
5. Step 5: Solve for x
   x = 11,978,958,042.89/140,910.71
6. Step 6: Final answer
   x = 85,010.99