Finding the Fourth Proportional to 28,484.53, 42,689.61 and 20,613.55

Step by Step Solution

1. Step 1: Write the proportion equation
   28,484.53 : 42,689.61 = 20,613.55 : x
2. Step 2: Convert to fraction form
   28,484.53/42,689.61 = 20,613.55/x
3. Step 3: Cross multiply
   28,484.53x = 42,689.61 × 20,613.55
4. Step 4: Simplify right side
   28,484.53x = 879,984,196.77
5. Step 5: Solve for x
   x = 879,984,196.77/28,484.53
6. Step 6: Final answer
   x = 30,893.41