Finding the Fourth Proportional to 78,680.21, 108,579.48 and 42,870.81

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.21 : 108,579.48 = 42,870.81 : x
2. Step 2: Convert to fraction form
   78,680.21/108,579.48 = 42,870.81/x
3. Step 3: Cross multiply
   78,680.21x = 108,579.48 × 42,870.81
4. Step 4: Simplify right side
   78,680.21x = 4,654,890,256.98
5. Step 5: Solve for x
   x = 4,654,890,256.98/78,680.21
6. Step 6: Final answer
   x = 59,162.15