Finding the Fourth Proportional to 105,511.82, 145,603.78 and 57,767.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,511.82 : 145,603.78 = 57,767.18 : x
2. Step 2: Convert to fraction form
   105,511.82/145,603.78 = 57,767.18/x
3. Step 3: Cross multiply
   105,511.82x = 145,603.78 × 57,767.18
4. Step 4: Simplify right side
   105,511.82x = 8,411,118,895.50
5. Step 5: Solve for x
   x = 8,411,118,895.50/105,511.82
6. Step 6: Final answer
   x = 79,717.32