Finding the Fourth Proportional to 111,945.78, 167,742.63 and 78,178.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,945.78 : 167,742.63 = 78,178.50 : x
2. Step 2: Convert to fraction form
   111,945.78/167,742.63 = 78,178.50/x
3. Step 3: Cross multiply
   111,945.78x = 167,742.63 × 78,178.50
4. Step 4: Simplify right side
   111,945.78x = 13,113,867,199.46
5. Step 5: Solve for x
   x = 13,113,867,199.46/111,945.78
6. Step 6: Final answer
   x = 117,144.81