Finding the Fourth Proportional to 105,117.54, 145,062.72 and 57,372

Step by Step Solution

1. Step 1: Write the proportion equation
   105,117.54 : 145,062.72 = 57,372 : x
2. Step 2: Convert to fraction form
   105,117.54/145,062.72 = 57,372/x
3. Step 3: Cross multiply
   105,117.54x = 145,062.72 × 57,372
4. Step 4: Simplify right side
   105,117.54x = 8,322,538,371.84
5. Step 5: Solve for x
   x = 8,322,538,371.84/105,117.54
6. Step 6: Final answer
   x = 79,173.64