Finding the Fourth Proportional to 71,621.78, 107,434.76 and 34,185.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71,621.78 : 107,434.76 = 34,185.78 : x
2. Step 2: Convert to fraction form
   71,621.78/107,434.76 = 34,185.78/x
3. Step 3: Cross multiply
   71,621.78x = 107,434.76 × 34,185.78
4. Step 4: Simplify right side
   71,621.78x = 3,672,740,898.78
5. Step 5: Solve for x
   x = 3,672,740,898.78/71,621.78
6. Step 6: Final answer
   x = 51,279.67