Finding the Fourth Proportional to 65,980.79, 90,931.37 and 46,861.40

Step by Step Solution

1. Step 1: Write the proportion equation
   65,980.79 : 90,931.37 = 46,861.40 : x
2. Step 2: Convert to fraction form
   65,980.79/90,931.37 = 46,861.40/x
3. Step 3: Cross multiply
   65,980.79x = 90,931.37 × 46,861.40
4. Step 4: Simplify right side
   65,980.79x = 4,261,170,847.46
5. Step 5: Solve for x
   x = 4,261,170,847.46/65,980.79
6. Step 6: Final answer
   x = 64,582.00