Finding the Fourth Proportional to 42,650.64, 64,300.74 and 39,643.92

Step by Step Solution

1. Step 1: Write the proportion equation
   42,650.64 : 64,300.74 = 39,643.92 : x
2. Step 2: Convert to fraction form
   42,650.64/64,300.74 = 39,643.92/x
3. Step 3: Cross multiply
   42,650.64x = 64,300.74 × 39,643.92
4. Step 4: Simplify right side
   42,650.64x = 2,549,133,392.50
5. Step 5: Solve for x
   x = 2,549,133,392.50/42,650.64
6. Step 6: Final answer
   x = 59,767.76