Finding the Fourth Proportional to 30,963, 42,730.56 and 18,216.84

Step by Step Solution

1. Step 1: Write the proportion equation
   30,963 : 42,730.56 = 18,216.84 : x
2. Step 2: Convert to fraction form
   30,963/42,730.56 = 18,216.84/x
3. Step 3: Cross multiply
   30,963x = 42,730.56 × 18,216.84
4. Step 4: Simplify right side
   30,963x = 778,415,774.63
5. Step 5: Solve for x
   x = 778,415,774.63/30,963
6. Step 6: Final answer
   x = 25,140.19