Finding the Fourth Proportional to 78,647.42, 117,970.41 and 31,889.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,647.42 : 117,970.41 = 31,889.18 : x
2. Step 2: Convert to fraction form
   78,647.42/117,970.41 = 31,889.18/x
3. Step 3: Cross multiply
   78,647.42x = 117,970.41 × 31,889.18
4. Step 4: Simplify right side
   78,647.42x = 3,761,979,639.16
5. Step 5: Solve for x
   x = 3,761,979,639.16/78,647.42
6. Step 6: Final answer
   x = 47,833.48