Finding the Fourth Proportional to 218,620.18, 301,696.85 and 123,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,620.18 : 301,696.85 = 123,128.50 : x
2. Step 2: Convert to fraction form
   218,620.18/301,696.85 = 123,128.50/x
3. Step 3: Cross multiply
   218,620.18x = 301,696.85 × 123,128.50
4. Step 4: Simplify right side
   218,620.18x = 37,147,480,595.23
5. Step 5: Solve for x
   x = 37,147,480,595.23/218,620.18
6. Step 6: Final answer
   x = 169,917.89