Finding the Fourth Proportional to 123,286.55, 169,980.57 and 100,602.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,286.55 : 169,980.57 = 100,602.50 : x
2. Step 2: Convert to fraction form
   123,286.55/169,980.57 = 100,602.50/x
3. Step 3: Cross multiply
   123,286.55x = 169,980.57 × 100,602.50
4. Step 4: Simplify right side
   123,286.55x = 17,100,469,443.52
5. Step 5: Solve for x
   x = 17,100,469,443.52/123,286.55
6. Step 6: Final answer
   x = 138,705.07