Finding the Fourth Proportional to 139,154.88, 191,988 and 78,719.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,154.88 : 191,988 = 78,719.52 : x
2. Step 2: Convert to fraction form
   139,154.88/191,988 = 78,719.52/x
3. Step 3: Cross multiply
   139,154.88x = 191,988 × 78,719.52
4. Step 4: Simplify right side
   139,154.88x = 15,113,203,205.76
5. Step 5: Solve for x
   x = 15,113,203,205.76/139,154.88
6. Step 6: Final answer
   x = 108,607.07