Finding the Fourth Proportional to 101,079.52, 139,539.72 and 78,367.12

Step by Step Solution

1. Step 1: Write the proportion equation
   101,079.52 : 139,539.72 = 78,367.12 : x
2. Step 2: Convert to fraction form
   101,079.52/139,539.72 = 78,367.12/x
3. Step 3: Cross multiply
   101,079.52x = 139,539.72 × 78,367.12
4. Step 4: Simplify right side
   101,079.52x = 10,935,325,982.01
5. Step 5: Solve for x
   x = 10,935,325,982.01/101,079.52
6. Step 6: Final answer
   x = 108,185.38