Finding the Fourth Proportional to 30,605.31, 42,242.04 and 18,666.18

Step by Step Solution

1. Step 1: Write the proportion equation
   30,605.31 : 42,242.04 = 18,666.18 : x
2. Step 2: Convert to fraction form
   30,605.31/42,242.04 = 18,666.18/x
3. Step 3: Cross multiply
   30,605.31x = 42,242.04 × 18,666.18
4. Step 4: Simplify right side
   30,605.31x = 788,497,522.21
5. Step 5: Solve for x
   x = 788,497,522.21/30,605.31
6. Step 6: Final answer
   x = 25,763.42