Finding the Fourth Proportional to 139,065.58, 191,909.32 and 78,648.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,065.58 : 191,909.32 = 78,648.08 : x
2. Step 2: Convert to fraction form
   139,065.58/191,909.32 = 78,648.08/x
3. Step 3: Cross multiply
   139,065.58x = 191,909.32 × 78,648.08
4. Step 4: Simplify right side
   139,065.58x = 15,093,299,552.11
5. Step 5: Solve for x
   x = 15,093,299,552.11/139,065.58
6. Step 6: Final answer
   x = 108,533.68