Finding the Fourth Proportional to 139,126.38, 191,994.40 and 78,695.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,126.38 : 191,994.40 = 78,695.72 : x
2. Step 2: Convert to fraction form
   139,126.38/191,994.40 = 78,695.72/x
3. Step 3: Cross multiply
   139,126.38x = 191,994.40 × 78,695.72
4. Step 4: Simplify right side
   139,126.38x = 15,109,137,543.97
5. Step 5: Solve for x
   x = 15,109,137,543.97/139,126.38
6. Step 6: Final answer
   x = 108,600.09