Finding the Fourth Proportional to 139,073.19, 191,910.51 and 78,649.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,073.19 : 191,910.51 = 78,649.50 : x
2. Step 2: Convert to fraction form
   139,073.19/191,910.51 = 78,649.50/x
3. Step 3: Cross multiply
   139,073.19x = 191,910.51 × 78,649.50
4. Step 4: Simplify right side
   139,073.19x = 15,093,665,656.25
5. Step 5: Solve for x
   x = 15,093,665,656.25/139,073.19
6. Step 6: Final answer
   x = 108,530.38