Finding the Fourth Proportional to 139,055.72, 191,885.06 and 78,617.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,055.72 : 191,885.06 = 78,617.98 : x
2. Step 2: Convert to fraction form
   139,055.72/191,885.06 = 78,617.98/x
3. Step 3: Cross multiply
   139,055.72x = 191,885.06 × 78,617.98
4. Step 4: Simplify right side
   139,055.72x = 15,085,615,809.38
5. Step 5: Solve for x
   x = 15,085,615,809.38/139,055.72
6. Step 6: Final answer
   x = 108,486.12