Finding the Fourth Proportional to 78,638.22, 117,852.12 and 28,671.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,638.22 : 117,852.12 = 28,671.30 : x
2. Step 2: Convert to fraction form
   78,638.22/117,852.12 = 28,671.30/x
3. Step 3: Cross multiply
   78,638.22x = 117,852.12 × 28,671.30
4. Step 4: Simplify right side
   78,638.22x = 3,378,973,488.16
5. Step 5: Solve for x
   x = 3,378,973,488.16/78,638.22
6. Step 6: Final answer
   x = 42,968.59