Finding the Fourth Proportional to 78,538.98, 117,831.69 and 45,282.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,538.98 : 117,831.69 = 45,282.90 : x
2. Step 2: Convert to fraction form
   78,538.98/117,831.69 = 45,282.90/x
3. Step 3: Cross multiply
   78,538.98x = 117,831.69 × 45,282.90
4. Step 4: Simplify right side
   78,538.98x = 5,335,760,635.10
5. Step 5: Solve for x
   x = 5,335,760,635.10/78,538.98
6. Step 6: Final answer
   x = 67,937.74