Finding the Fourth Proportional to 105,513.46, 145,602.83 and 57,757.58

Step by Step Solution

1. Step 1: Write the proportion equation
   105,513.46 : 145,602.83 = 57,757.58 : x
2. Step 2: Convert to fraction form
   105,513.46/145,602.83 = 57,757.58/x
3. Step 3: Cross multiply
   105,513.46x = 145,602.83 × 57,757.58
4. Step 4: Simplify right side
   105,513.46x = 8,409,667,101.95
5. Step 5: Solve for x
   x = 8,409,667,101.95/105,513.46
6. Step 6: Final answer
   x = 79,702.32