Finding the Fourth Proportional to 138,949.51, 191,747.82 and 78,518.86

Step by Step Solution

1. Step 1: Write the proportion equation
   138,949.51 : 191,747.82 = 78,518.86 : x
2. Step 2: Convert to fraction form
   138,949.51/191,747.82 = 78,518.86/x
3. Step 3: Cross multiply
   138,949.51x = 191,747.82 × 78,518.86
4. Step 4: Simplify right side
   138,949.51x = 15,055,820,233.89
5. Step 5: Solve for x
   x = 15,055,820,233.89/138,949.51
6. Step 6: Final answer
   x = 108,354.61