Finding the Fourth Proportional to 21,070.38, 29,070.15 and 13,903.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,070.38 : 29,070.15 = 13,903.86 : x
2. Step 2: Convert to fraction form
   21,070.38/29,070.15 = 13,903.86/x
3. Step 3: Cross multiply
   21,070.38x = 29,070.15 × 13,903.86
4. Step 4: Simplify right side
   21,070.38x = 404,187,295.78
5. Step 5: Solve for x
   x = 404,187,295.78/21,070.38
6. Step 6: Final answer
   x = 19,182.72