Finding the Fourth Proportional to 158,636.37, 218,929.33 and 90,663.40

Step by Step Solution

1. Step 1: Write the proportion equation
   158,636.37 : 218,929.33 = 90,663.40 : x
2. Step 2: Convert to fraction form
   158,636.37/218,929.33 = 90,663.40/x
3. Step 3: Cross multiply
   158,636.37x = 218,929.33 × 90,663.40
4. Step 4: Simplify right side
   158,636.37x = 19,848,877,139.03
5. Step 5: Solve for x
   x = 19,848,877,139.03/158,636.37
6. Step 6: Final answer
   x = 125,121.86