Finding the Fourth Proportional to 139,065.96, 191,909.82 and 78,648.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,065.96 : 191,909.82 = 78,648.42 : x
2. Step 2: Convert to fraction form
   139,065.96/191,909.82 = 78,648.42/x
3. Step 3: Cross multiply
   139,065.96x = 191,909.82 × 78,648.42
4. Step 4: Simplify right side
   139,065.96x = 15,093,404,125.48
5. Step 5: Solve for x
   x = 15,093,404,125.48/139,065.96
6. Step 6: Final answer
   x = 108,534.14