Finding the Fourth Proportional to 78,665.22, 108,557.58 and 42,855.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,665.22 : 108,557.58 = 42,855.15 : x
2. Step 2: Convert to fraction form
   78,665.22/108,557.58 = 42,855.15/x
3. Step 3: Cross multiply
   78,665.22x = 108,557.58 × 42,855.15
4. Step 4: Simplify right side
   78,665.22x = 4,652,251,374.54
5. Step 5: Solve for x
   x = 4,652,251,374.54/78,665.22
6. Step 6: Final answer
   x = 59,139.88