Finding the Fourth Proportional to 117,105.55, 161,605.76 and 63,390.40

Step by Step Solution

1. Step 1: Write the proportion equation
   117,105.55 : 161,605.76 = 63,390.40 : x
2. Step 2: Convert to fraction form
   117,105.55/161,605.76 = 63,390.40/x
3. Step 3: Cross multiply
   117,105.55x = 161,605.76 × 63,390.40
4. Step 4: Simplify right side
   117,105.55x = 10,244,254,172.72
5. Step 5: Solve for x
   x = 10,244,254,172.72/117,105.55
6. Step 6: Final answer
   x = 87,478.81