Finding the Fourth Proportional to 42,289.79, 63,404.67 and 21,214.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,289.79 : 63,404.67 = 21,214.67 : x
2. Step 2: Convert to fraction form
   42,289.79/63,404.67 = 21,214.67/x
3. Step 3: Cross multiply
   42,289.79x = 63,404.67 × 21,214.67
4. Step 4: Simplify right side
   42,289.79x = 1,345,109,150.51
5. Step 5: Solve for x
   x = 1,345,109,150.51/42,289.79
6. Step 6: Final answer
   x = 31,806.95