Finding the Fourth Proportional to 56,628.29, 78,147.55 and 30,786.89

Step by Step Solution

1. Step 1: Write the proportion equation
   56,628.29 : 78,147.55 = 30,786.89 : x
2. Step 2: Convert to fraction form
   56,628.29/78,147.55 = 30,786.89/x
3. Step 3: Cross multiply
   56,628.29x = 78,147.55 × 30,786.89
4. Step 4: Simplify right side
   56,628.29x = 2,405,920,144.02
5. Step 5: Solve for x
   x = 2,405,920,144.02/56,628.29
6. Step 6: Final answer
   x = 42,486.19