Finding the Fourth Proportional to 78,442.80, 117,634.71 and 28,510.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,442.80 : 117,634.71 = 28,510.56 : x
2. Step 2: Convert to fraction form
   78,442.80/117,634.71 = 28,510.56/x
3. Step 3: Cross multiply
   78,442.80x = 117,634.71 × 28,510.56
4. Step 4: Simplify right side
   78,442.80x = 3,353,831,457.54
5. Step 5: Solve for x
   x = 3,353,831,457.54/78,442.80
6. Step 6: Final answer
   x = 42,755.12