Finding the Fourth Proportional to 139,068.18, 191,917.87 and 78,647.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,068.18 : 191,917.87 = 78,647.86 : x
2. Step 2: Convert to fraction form
   139,068.18/191,917.87 = 78,647.86/x
3. Step 3: Cross multiply
   139,068.18x = 191,917.87 × 78,647.86
4. Step 4: Simplify right side
   139,068.18x = 15,093,930,174.38
5. Step 5: Solve for x
   x = 15,093,930,174.38/139,068.18
6. Step 6: Final answer
   x = 108,536.18