Finding the Fourth Proportional to 105,501.30, 145,595.22 and 57,754.64

Step by Step Solution

1. Step 1: Write the proportion equation
   105,501.30 : 145,595.22 = 57,754.64 : x
2. Step 2: Convert to fraction form
   105,501.30/145,595.22 = 57,754.64/x
3. Step 3: Cross multiply
   105,501.30x = 145,595.22 × 57,754.64
4. Step 4: Simplify right side
   105,501.30x = 8,408,799,516.82
5. Step 5: Solve for x
   x = 8,408,799,516.82/105,501.30
6. Step 6: Final answer
   x = 79,703.28