Finding the Fourth Proportional to 30,526.47, 42,128.10 and 17,100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,526.47 : 42,128.10 = 17,100.72 : x
2. Step 2: Convert to fraction form
   30,526.47/42,128.10 = 17,100.72/x
3. Step 3: Cross multiply
   30,526.47x = 42,128.10 × 17,100.72
4. Step 4: Simplify right side
   30,526.47x = 720,420,842.23
5. Step 5: Solve for x
   x = 720,420,842.23/30,526.47
6. Step 6: Final answer
   x = 23,599.87