Finding the Fourth Proportional to 139,064.55, 191,920.94 and 78,645.93

Step by Step Solution

1. Step 1: Write the proportion equation
   139,064.55 : 191,920.94 = 78,645.93 : x
2. Step 2: Convert to fraction form
   139,064.55/191,920.94 = 78,645.93/x
3. Step 3: Cross multiply
   139,064.55x = 191,920.94 × 78,645.93
4. Step 4: Simplify right side
   139,064.55x = 15,093,800,812.77
5. Step 5: Solve for x
   x = 15,093,800,812.77/139,064.55
6. Step 6: Final answer
   x = 108,538.09