Finding the Fourth Proportional to 138,764.15, 191,499.49 and 78,345.54

Step by Step Solution

1. Step 1: Write the proportion equation
   138,764.15 : 191,499.49 = 78,345.54 : x
2. Step 2: Convert to fraction form
   138,764.15/191,499.49 = 78,345.54/x
3. Step 3: Cross multiply
   138,764.15x = 191,499.49 × 78,345.54
4. Step 4: Simplify right side
   138,764.15x = 15,003,131,051.71
5. Step 5: Solve for x
   x = 15,003,131,051.71/138,764.15
6. Step 6: Final answer
   x = 108,119.65