Finding the Fourth Proportional to 21,109.18, 31,700.03 and 18,742.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.18 : 31,700.03 = 18,742.59 : x
2. Step 2: Convert to fraction form
   21,109.18/31,700.03 = 18,742.59/x
3. Step 3: Cross multiply
   21,109.18x = 31,700.03 × 18,742.59
4. Step 4: Simplify right side
   21,109.18x = 594,140,562.60
5. Step 5: Solve for x
   x = 594,140,562.60/21,109.18
6. Step 6: Final answer
   x = 28,146.08