Finding the Fourth Proportional to 120,510.72, 180,530.82 and 57,240.81

Step by Step Solution

1. Step 1: Write the proportion equation
   120,510.72 : 180,530.82 = 57,240.81 : x
2. Step 2: Convert to fraction form
   120,510.72/180,530.82 = 57,240.81/x
3. Step 3: Cross multiply
   120,510.72x = 180,530.82 × 57,240.81
4. Step 4: Simplify right side
   120,510.72x = 10,333,730,366.76
5. Step 5: Solve for x
   x = 10,333,730,366.76/120,510.72
6. Step 6: Final answer
   x = 85,749.47