Finding the Fourth Proportional to 105,522.82, 145,621.46 and 57,776.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,522.82 : 145,621.46 = 57,776.15 : x
2. Step 2: Convert to fraction form
   105,522.82/145,621.46 = 57,776.15/x
3. Step 3: Cross multiply
   105,522.82x = 145,621.46 × 57,776.15
4. Step 4: Simplify right side
   105,522.82x = 8,413,447,824.67
5. Step 5: Solve for x
   x = 8,413,447,824.67/105,522.82
6. Step 6: Final answer
   x = 79,731.08