Finding the Fourth Proportional to 42,370.72, 63,556.72 and 20,186.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,370.72 : 63,556.72 = 20,186.40 : x
2. Step 2: Convert to fraction form
   42,370.72/63,556.72 = 20,186.40/x
3. Step 3: Cross multiply
   42,370.72x = 63,556.72 × 20,186.40
4. Step 4: Simplify right side
   42,370.72x = 1,282,981,372.61
5. Step 5: Solve for x
   x = 1,282,981,372.61/42,370.72
6. Step 6: Final answer
   x = 30,279.90