Finding the Fourth Proportional to 42,975, 64,464.12 and 13,392.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,975 : 64,464.12 = 13,392.72 : x
2. Step 2: Convert to fraction form
   42,975/64,464.12 = 13,392.72/x
3. Step 3: Cross multiply
   42,975x = 64,464.12 × 13,392.72
4. Step 4: Simplify right side
   42,975x = 863,349,909.21
5. Step 5: Solve for x
   x = 863,349,909.21/42,975
6. Step 6: Final answer
   x = 20,089.58