Finding the Fourth Proportional to 136,329.92, 188,162.28 and 78,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   136,329.92 : 188,162.28 = 78,978.56 : x
2. Step 2: Convert to fraction form
   136,329.92/188,162.28 = 78,978.56/x
3. Step 3: Cross multiply
   136,329.92x = 188,162.28 × 78,978.56
4. Step 4: Simplify right side
   136,329.92x = 14,860,785,920.72
5. Step 5: Solve for x
   x = 14,860,785,920.72/136,329.92
6. Step 6: Final answer
   x = 109,006.05