Finding the Fourth Proportional to 138,541.89, 191,185.59 and 78,112.65

Step by Step Solution

1. Step 1: Write the proportion equation
   138,541.89 : 191,185.59 = 78,112.65 : x
2. Step 2: Convert to fraction form
   138,541.89/191,185.59 = 78,112.65/x
3. Step 3: Cross multiply
   138,541.89x = 191,185.59 × 78,112.65
4. Step 4: Simplify right side
   138,541.89x = 14,934,013,076.71
5. Step 5: Solve for x
   x = 14,934,013,076.71/138,541.89
6. Step 6: Final answer
   x = 107,794.21