Finding the Fourth Proportional to 105,083.42, 145,015.60 and 57,337.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,083.42 : 145,015.60 = 57,337.78 : x
2. Step 2: Convert to fraction form
   105,083.42/145,015.60 = 57,337.78/x
3. Step 3: Cross multiply
   105,083.42x = 145,015.60 × 57,337.78
4. Step 4: Simplify right side
   105,083.42x = 8,314,872,569.37
5. Step 5: Solve for x
   x = 8,314,872,569.37/105,083.42
6. Step 6: Final answer
   x = 79,126.40