Finding the Fourth Proportional to 105,507.77, 145,600.76 and 57,764.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,507.77 : 145,600.76 = 57,764.15 : x
2. Step 2: Convert to fraction form
   105,507.77/145,600.76 = 57,764.15/x
3. Step 3: Cross multiply
   105,507.77x = 145,600.76 × 57,764.15
4. Step 4: Simplify right side
   105,507.77x = 8,410,503,557.16
5. Step 5: Solve for x
   x = 8,410,503,557.16/105,507.77
6. Step 6: Final answer
   x = 79,714.54