Finding the Fourth Proportional to 78,640.52, 117,390.56 and 72,786.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78,640.52 : 117,390.56 = 72,786.86 : x
2. Step 2: Convert to fraction form
   78,640.52/117,390.56 = 72,786.86/x
3. Step 3: Cross multiply
   78,640.52x = 117,390.56 × 72,786.86
4. Step 4: Simplify right side
   78,640.52x = 8,544,490,256.04
5. Step 5: Solve for x
   x = 8,544,490,256.04/78,640.52
6. Step 6: Final answer
   x = 108,652.51