Finding the Fourth Proportional to 105,242.76, 145,235.52 and 57,496.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,242.76 : 145,235.52 = 57,496.89 : x
2. Step 2: Convert to fraction form
   105,242.76/145,235.52 = 57,496.89/x
3. Step 3: Cross multiply
   105,242.76x = 145,235.52 × 57,496.89
4. Step 4: Simplify right side
   105,242.76x = 8,350,590,717.53
5. Step 5: Solve for x
   x = 8,350,590,717.53/105,242.76
6. Step 6: Final answer
   x = 79,345.99