Finding the Fourth Proportional to 111,026.69, 153,119.97 and 78,697.35

Step by Step Solution

1. Step 1: Write the proportion equation
   111,026.69 : 153,119.97 = 78,697.35 : x
2. Step 2: Convert to fraction form
   111,026.69/153,119.97 = 78,697.35/x
3. Step 3: Cross multiply
   111,026.69x = 153,119.97 × 78,697.35
4. Step 4: Simplify right side
   111,026.69x = 12,050,135,871.08
5. Step 5: Solve for x
   x = 12,050,135,871.08/111,026.69
6. Step 6: Final answer
   x = 108,533.69