Finding the Fourth Proportional to 56,640.75, 78,164.31 and 31,147.56

Step by Step Solution

1. Step 1: Write the proportion equation
   56,640.75 : 78,164.31 = 31,147.56 : x
2. Step 2: Convert to fraction form
   56,640.75/78,164.31 = 31,147.56/x
3. Step 3: Cross multiply
   56,640.75x = 78,164.31 × 31,147.56
4. Step 4: Simplify right side
   56,640.75x = 2,434,627,535.58
5. Step 5: Solve for x
   x = 2,434,627,535.58/56,640.75
6. Step 6: Final answer
   x = 42,983.67