Finding the Fourth Proportional to 128,898.31, 193,067.60 and 78,826.61

Step by Step Solution

1. Step 1: Write the proportion equation
   128,898.31 : 193,067.60 = 78,826.61 : x
2. Step 2: Convert to fraction form
   128,898.31/193,067.60 = 78,826.61/x
3. Step 3: Cross multiply
   128,898.31x = 193,067.60 × 78,826.61
4. Step 4: Simplify right side
   128,898.31x = 15,218,863,583.27
5. Step 5: Solve for x
   x = 15,218,863,583.27/128,898.31
6. Step 6: Final answer
   x = 118,068.76