Finding the Fourth Proportional to 78,640.21, 108,524.72 and 42,830.19

Step by Step Solution

1. Step 1: Write the proportion equation
   78,640.21 : 108,524.72 = 42,830.19 : x
2. Step 2: Convert to fraction form
   78,640.21/108,524.72 = 42,830.19/x
3. Step 3: Cross multiply
   78,640.21x = 108,524.72 × 42,830.19
4. Step 4: Simplify right side
   78,640.21x = 4,648,134,377.30
5. Step 5: Solve for x
   x = 4,648,134,377.30/78,640.21
6. Step 6: Final answer
   x = 59,106.34