Finding the Fourth Proportional to 111,028.92, 153,123.08 and 78,699.60

Step by Step Solution

1. Step 1: Write the proportion equation
   111,028.92 : 153,123.08 = 78,699.60 : x
2. Step 2: Convert to fraction form
   111,028.92/153,123.08 = 78,699.60/x
3. Step 3: Cross multiply
   111,028.92x = 153,123.08 × 78,699.60
4. Step 4: Simplify right side
   111,028.92x = 12,050,725,146.77
5. Step 5: Solve for x
   x = 12,050,725,146.77/111,028.92
6. Step 6: Final answer
   x = 108,536.81