Finding the Fourth Proportional to 52,990.72, 79,468.53 and 21,392.62

Step by Step Solution

1. Step 1: Write the proportion equation
   52,990.72 : 79,468.53 = 21,392.62 : x
2. Step 2: Convert to fraction form
   52,990.72/79,468.53 = 21,392.62/x
3. Step 3: Cross multiply
   52,990.72x = 79,468.53 × 21,392.62
4. Step 4: Simplify right side
   52,990.72x = 1,700,040,064.25
5. Step 5: Solve for x
   x = 1,700,040,064.25/52,990.72
6. Step 6: Final answer
   x = 32,081.84