Finding the Fourth Proportional to 102,424.14, 141,345.90 and 57,105

Step by Step Solution

1. Step 1: Write the proportion equation
   102,424.14 : 141,345.90 = 57,105 : x
2. Step 2: Convert to fraction form
   102,424.14/141,345.90 = 57,105/x
3. Step 3: Cross multiply
   102,424.14x = 141,345.90 × 57,105
4. Step 4: Simplify right side
   102,424.14x = 8,071,557,619.50
5. Step 5: Solve for x
   x = 8,071,557,619.50/102,424.14
6. Step 6: Final answer
   x = 78,805.23