Finding the Fourth Proportional to 105,620.40, 145,755.72 and 57,876.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,620.40 : 145,755.72 = 57,876.72 : x
2. Step 2: Convert to fraction form
   105,620.40/145,755.72 = 57,876.72/x
3. Step 3: Cross multiply
   105,620.40x = 145,755.72 × 57,876.72
4. Step 4: Simplify right side
   105,620.40x = 8,435,862,994.84
5. Step 5: Solve for x
   x = 8,435,862,994.84/105,620.40
6. Step 6: Final answer
   x = 79,869.64