Finding the Fourth Proportional to 47,085.99, 64,978.36 and 28,223.11

Step by Step Solution

1. Step 1: Write the proportion equation
   47,085.99 : 64,978.36 = 28,223.11 : x
2. Step 2: Convert to fraction form
   47,085.99/64,978.36 = 28,223.11/x
3. Step 3: Cross multiply
   47,085.99x = 64,978.36 × 28,223.11
4. Step 4: Simplify right side
   47,085.99x = 1,833,891,401.90
5. Step 5: Solve for x
   x = 1,833,891,401.90/47,085.99
6. Step 6: Final answer
   x = 38,947.71