Finding the Fourth Proportional to 28,572.01, 42,885.72 and 13,791.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,572.01 : 42,885.72 = 13,791.34 : x
2. Step 2: Convert to fraction form
   28,572.01/42,885.72 = 13,791.34/x
3. Step 3: Cross multiply
   28,572.01x = 42,885.72 × 13,791.34
4. Step 4: Simplify right side
   28,572.01x = 591,451,545.66
5. Step 5: Solve for x
   x = 591,451,545.66/28,572.01
6. Step 6: Final answer
   x = 20,700.38