Finding the Fourth Proportional to 78,646.42, 117,968.91 and 31,888.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,646.42 : 117,968.91 = 31,888.18 : x
2. Step 2: Convert to fraction form
   78,646.42/117,968.91 = 31,888.18/x
3. Step 3: Cross multiply
   78,646.42x = 117,968.91 × 31,888.18
4. Step 4: Simplify right side
   78,646.42x = 3,761,813,836.48
5. Step 5: Solve for x
   x = 3,761,813,836.48/78,646.42
6. Step 6: Final answer
   x = 47,831.98