Finding the Fourth Proportional to 51,123.31, 76,729.25 and 51,005.09

Step by Step Solution

1. Step 1: Write the proportion equation
   51,123.31 : 76,729.25 = 51,005.09 : x
2. Step 2: Convert to fraction form
   51,123.31/76,729.25 = 51,005.09/x
3. Step 3: Cross multiply
   51,123.31x = 76,729.25 × 51,005.09
4. Step 4: Simplify right side
   51,123.31x = 3,913,582,621.22
5. Step 5: Solve for x
   x = 3,913,582,621.22/51,123.31
6. Step 6: Final answer
   x = 76,551.83