Finding the Fourth Proportional to 117,105.45, 161,605.56 and 63,390.30

Step by Step Solution

1. Step 1: Write the proportion equation
   117,105.45 : 161,605.56 = 63,390.30 : x
2. Step 2: Convert to fraction form
   117,105.45/161,605.56 = 63,390.30/x
3. Step 3: Cross multiply
   117,105.45x = 161,605.56 × 63,390.30
4. Step 4: Simplify right side
   117,105.45x = 10,244,224,930.07
5. Step 5: Solve for x
   x = 10,244,224,930.07/117,105.45
6. Step 6: Final answer
   x = 87,478.64