Finding the Fourth Proportional to 78,700.95, 108,604.15 and 42,890.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,700.95 : 108,604.15 = 42,890.20 : x
2. Step 2: Convert to fraction form
   78,700.95/108,604.15 = 42,890.20/x
3. Step 3: Cross multiply
   78,700.95x = 108,604.15 × 42,890.20
4. Step 4: Simplify right side
   78,700.95x = 4,658,053,714.33
5. Step 5: Solve for x
   x = 4,658,053,714.33/78,700.95
6. Step 6: Final answer
   x = 59,186.75