Finding the Fourth Proportional to 78,291, 108,038.43 and 42,479.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,291 : 108,038.43 = 42,479.64 : x
2. Step 2: Convert to fraction form
   78,291/108,038.43 = 42,479.64/x
3. Step 3: Cross multiply
   78,291x = 108,038.43 × 42,479.64
4. Step 4: Simplify right side
   78,291x = 4,589,433,612.57
5. Step 5: Solve for x
   x = 4,589,433,612.57/78,291
6. Step 6: Final answer
   x = 58,620.19