Finding the Fourth Proportional to 78,748.70, 118,146.90 and 28,141.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,748.70 : 118,146.90 = 28,141.10 : x
2. Step 2: Convert to fraction form
   78,748.70/118,146.90 = 28,141.10/x
3. Step 3: Cross multiply
   78,748.70x = 118,146.90 × 28,141.10
4. Step 4: Simplify right side
   78,748.70x = 3,324,783,727.59
5. Step 5: Solve for x
   x = 3,324,783,727.59/78,748.70
6. Step 6: Final answer
   x = 42,220.17