Finding the Fourth Proportional to 42,711.35, 64,080.72 and 20,526.35

Step by Step Solution

1. Step 1: Write the proportion equation
   42,711.35 : 64,080.72 = 20,526.35 : x
2. Step 2: Convert to fraction form
   42,711.35/64,080.72 = 20,526.35/x
3. Step 3: Cross multiply
   42,711.35x = 64,080.72 × 20,526.35
4. Step 4: Simplify right side
   42,711.35x = 1,315,342,966.57
5. Step 5: Solve for x
   x = 1,315,342,966.57/42,711.35
6. Step 6: Final answer
   x = 30,796.10