Finding the Fourth Proportional to 139,066.58, 191,910.70 and 78,649.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,066.58 : 191,910.70 = 78,649.08 : x
2. Step 2: Convert to fraction form
   139,066.58/191,910.70 = 78,649.08/x
3. Step 3: Cross multiply
   139,066.58x = 191,910.70 × 78,649.08
4. Step 4: Simplify right side
   139,066.58x = 15,093,599,997.16
5. Step 5: Solve for x
   x = 15,093,599,997.16/139,066.58
6. Step 6: Final answer
   x = 108,535.06