Finding the Fourth Proportional to 105,620.61, 145,759.83 and 57,876.99

Step by Step Solution

1. Step 1: Write the proportion equation
   105,620.61 : 145,759.83 = 57,876.99 : x
2. Step 2: Convert to fraction form
   105,620.61/145,759.83 = 57,876.99/x
3. Step 3: Cross multiply
   105,620.61x = 145,759.83 × 57,876.99
4. Step 4: Simplify right side
   105,620.61x = 8,436,140,223.31
5. Step 5: Solve for x
   x = 8,436,140,223.31/105,620.61
6. Step 6: Final answer
   x = 79,872.10