Finding the Fourth Proportional to 111,321, 166,562.19 and 78,106.68

Step by Step Solution

1. Step 1: Write the proportion equation
   111,321 : 166,562.19 = 78,106.68 : x
2. Step 2: Convert to fraction form
   111,321/166,562.19 = 78,106.68/x
3. Step 3: Cross multiply
   111,321x = 166,562.19 × 78,106.68
4. Step 4: Simplify right side
   111,321x = 13,009,619,674.43
5. Step 5: Solve for x
   x = 13,009,619,674.43/111,321
6. Step 6: Final answer
   x = 116,865.82