Finding the Fourth Proportional to 105,224.96, 145,211.68 and 57,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,224.96 : 145,211.68 = 57,478.72 : x
2. Step 2: Convert to fraction form
   105,224.96/145,211.68 = 57,478.72/x
3. Step 3: Cross multiply
   105,224.96x = 145,211.68 × 57,478.72
4. Step 4: Simplify right side
   105,224.96x = 8,346,581,495.45
5. Step 5: Solve for x
   x = 8,346,581,495.45/105,224.96
6. Step 6: Final answer
   x = 79,321.31