Finding the Fourth Proportional to 78,276.48, 117,259.20 and 43,128.96

Step by Step Solution

1. Step 1: Write the proportion equation
   78,276.48 : 117,259.20 = 43,128.96 : x
2. Step 2: Convert to fraction form
   78,276.48/117,259.20 = 43,128.96/x
3. Step 3: Cross multiply
   78,276.48x = 117,259.20 × 43,128.96
4. Step 4: Simplify right side
   78,276.48x = 5,057,267,346.43
5. Step 5: Solve for x
   x = 5,057,267,346.43/78,276.48
6. Step 6: Final answer
   x = 64,607.75