Finding the Fourth Proportional to 30,468.42, 42,047.10 and 21,531.69

Step by Step Solution

1. Step 1: Write the proportion equation
   30,468.42 : 42,047.10 = 21,531.69 : x
2. Step 2: Convert to fraction form
   30,468.42/42,047.10 = 21,531.69/x
3. Step 3: Cross multiply
   30,468.42x = 42,047.10 × 21,531.69
4. Step 4: Simplify right side
   30,468.42x = 905,345,122.60
5. Step 5: Solve for x
   x = 905,345,122.60/30,468.42
6. Step 6: Final answer
   x = 29,714.21