Finding the Fourth Proportional to 78,651.28, 108,536.36 and 42,840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,651.28 : 108,536.36 = 42,840.72 : x
2. Step 2: Convert to fraction form
   78,651.28/108,536.36 = 42,840.72/x
3. Step 3: Cross multiply
   78,651.28x = 108,536.36 × 42,840.72
4. Step 4: Simplify right side
   78,651.28x = 4,649,775,808.58
5. Step 5: Solve for x
   x = 4,649,775,808.58/78,651.28
6. Step 6: Final answer
   x = 59,118.88