Finding the Fourth Proportional to 78,446.88, 108,256.70 and 42,636.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,446.88 : 108,256.70 = 42,636.78 : x
2. Step 2: Convert to fraction form
   78,446.88/108,256.70 = 42,636.78/x
3. Step 3: Cross multiply
   78,446.88x = 108,256.70 × 42,636.78
4. Step 4: Simplify right side
   78,446.88x = 4,615,717,208.02
5. Step 5: Solve for x
   x = 4,615,717,208.02/78,446.88
6. Step 6: Final answer
   x = 58,838.76