Finding the Fourth Proportional to 102,391.09, 141,300.41 and 57,072

Step by Step Solution

1. Step 1: Write the proportion equation
   102,391.09 : 141,300.41 = 57,072 : x
2. Step 2: Convert to fraction form
   102,391.09/141,300.41 = 57,072/x
3. Step 3: Cross multiply
   102,391.09x = 141,300.41 × 57,072
4. Step 4: Simplify right side
   102,391.09x = 8,064,296,999.52
5. Step 5: Solve for x
   x = 8,064,296,999.52/102,391.09
6. Step 6: Final answer
   x = 78,759.75