Finding the Fourth Proportional to 112,109.78, 167,977.81 and 78,770.15

Step by Step Solution

1. Step 1: Write the proportion equation
   112,109.78 : 167,977.81 = 78,770.15 : x
2. Step 2: Convert to fraction form
   112,109.78/167,977.81 = 78,770.15/x
3. Step 3: Cross multiply
   112,109.78x = 167,977.81 × 78,770.15
4. Step 4: Simplify right side
   112,109.78x = 13,231,636,253.56
5. Step 5: Solve for x
   x = 13,231,636,253.56/112,109.78
6. Step 6: Final answer
   x = 118,023.92