Finding the Fourth Proportional to 105,623.20, 145,759.17 and 57,876.42

Step by Step Solution

1. Step 1: Write the proportion equation
   105,623.20 : 145,759.17 = 57,876.42 : x
2. Step 2: Convert to fraction form
   105,623.20/145,759.17 = 57,876.42/x
3. Step 3: Cross multiply
   105,623.20x = 145,759.17 × 57,876.42
4. Step 4: Simplify right side
   105,623.20x = 8,436,018,941.77
5. Step 5: Solve for x
   x = 8,436,018,941.77/105,623.20
6. Step 6: Final answer
   x = 79,869.00