Finding the Fourth Proportional to 139,016.62, 191,851.20 and 78,592.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,016.62 : 191,851.20 = 78,592.88 : x
2. Step 2: Convert to fraction form
   139,016.62/191,851.20 = 78,592.88/x
3. Step 3: Cross multiply
   139,016.62x = 191,851.20 × 78,592.88
4. Step 4: Simplify right side
   139,016.62x = 15,078,139,015.57
5. Step 5: Solve for x
   x = 15,078,139,015.57/139,016.62
6. Step 6: Final answer
   x = 108,462.86