Finding the Fourth Proportional to 139,052.17, 191,895.78 and 78,631.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,052.17 : 191,895.78 = 78,631.86 : x
2. Step 2: Convert to fraction form
   139,052.17/191,895.78 = 78,631.86/x
3. Step 3: Cross multiply
   139,052.17x = 191,895.78 × 78,631.86
4. Step 4: Simplify right side
   139,052.17x = 15,089,121,658.89
5. Step 5: Solve for x
   x = 15,089,121,658.89/139,052.17
6. Step 6: Final answer
   x = 108,514.10