Finding the Fourth Proportional to 28,131.34, 42,160.09 and 20,701.01

Step by Step Solution

1. Step 1: Write the proportion equation
   28,131.34 : 42,160.09 = 20,701.01 : x
2. Step 2: Convert to fraction form
   28,131.34/42,160.09 = 20,701.01/x
3. Step 3: Cross multiply
   28,131.34x = 42,160.09 × 20,701.01
4. Step 4: Simplify right side
   28,131.34x = 872,756,444.69
5. Step 5: Solve for x
   x = 872,756,444.69/28,131.34
6. Step 6: Final answer
   x = 31,024.35