Finding the Fourth Proportional to 42,961.30, 64,409.55 and 28,173.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,961.30 : 64,409.55 = 28,173.94 : x
2. Step 2: Convert to fraction form
   42,961.30/64,409.55 = 28,173.94/x
3. Step 3: Cross multiply
   42,961.30x = 64,409.55 × 28,173.94
4. Step 4: Simplify right side
   42,961.30x = 1,814,670,530.45
5. Step 5: Solve for x
   x = 1,814,670,530.45/42,961.30
6. Step 6: Final answer
   x = 42,239.66