Finding the Fourth Proportional to 65,433.28, 90,298.56 and 37,139.20

Step by Step Solution

1. Step 1: Write the proportion equation
   65,433.28 : 90,298.56 = 37,139.20 : x
2. Step 2: Convert to fraction form
   65,433.28/90,298.56 = 37,139.20/x
3. Step 3: Cross multiply
   65,433.28x = 90,298.56 × 37,139.20
4. Step 4: Simplify right side
   65,433.28x = 3,353,616,279.55
5. Step 5: Solve for x
   x = 3,353,616,279.55/65,433.28
6. Step 6: Final answer
   x = 51,252.46