Finding the Fourth Proportional to 30,836.31, 42,554.10 and 16,689.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,836.31 : 42,554.10 = 16,689.15 : x
2. Step 2: Convert to fraction form
   30,836.31/42,554.10 = 16,689.15/x
3. Step 3: Cross multiply
   30,836.31x = 42,554.10 × 16,689.15
4. Step 4: Simplify right side
   30,836.31x = 710,191,897.74
5. Step 5: Solve for x
   x = 710,191,897.74/30,836.31
6. Step 6: Final answer
   x = 23,031.03