Finding the Fourth Proportional to 89,978.72, 124,154.37 and 51,729.30

Step by Step Solution

1. Step 1: Write the proportion equation
   89,978.72 : 124,154.37 = 51,729.30 : x
2. Step 2: Convert to fraction form
   89,978.72/124,154.37 = 51,729.30/x
3. Step 3: Cross multiply
   89,978.72x = 124,154.37 × 51,729.30
4. Step 4: Simplify right side
   89,978.72x = 6,422,418,652.04
5. Step 5: Solve for x
   x = 6,422,418,652.04/89,978.72
6. Step 6: Final answer
   x = 71,377.09