Finding the Fourth Proportional to 42,830.64, 64,209 and 20,613.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,830.64 : 64,209 = 20,613.42 : x
2. Step 2: Convert to fraction form
   42,830.64/64,209 = 20,613.42/x
3. Step 3: Cross multiply
   42,830.64x = 64,209 × 20,613.42
4. Step 4: Simplify right side
   42,830.64x = 1,323,567,084.78
5. Step 5: Solve for x
   x = 1,323,567,084.78/42,830.64
6. Step 6: Final answer
   x = 30,902.34